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astra-53 [7]
3 years ago
8

A developer working on a time management application wants to make total hours for each timecard available to application users.

A timecard entry has a Master-Detail relationship to a timecard. Which approach should the developer use to accomplish this declaratively?
(A) A roll-up Summary field on the Timecard Object that calculates the total hours fromtimecard entries for that timecard
(B) A process builder process that updates a field on the timecard when a timecard entry iscreated
(C) An apex trigger that sues an aggregate query to calculate the hours for a given timecard andstores it in a custom field.
(D) A visualforce page that calculates the total number of hours for a timecard and displays it onthe page.
Computers and Technology
1 answer:
Llana [10]3 years ago
3 0

Answer:

The correct option to the following question is A.) .

Explanation:

A Timecard is an application which is used for recording the times the user is working and it is an application for record the time upon logging in to the Web Timesheet, a user punches out and into the mark time they stop and start the works, along with the any comment they choose to enter.

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"Explain the functionality of the different layers found in the network protocol stack of an operating system such as Linux"
arsen [322]

Answer:

There are 7 layers in linux.

Explanation:

As networking is difficult and complex.

Imagine if every application had to know how to communicate on every step that would be more than just complex. So, rather than reinvent something which will help it to communicate let’s just make something that will automatically controls the communication and for that protocols came in to live.

As for the linux operating system, it is not exceptional from other operating systems.

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3. Protocol agnostic interface

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5. Device agnostic interface

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All the layers vary in their functionality.

One more important thing to remember is that the network protocol stack layers is not one way its 2 way communication. First, when a client request to a network and second, when the request is full filled.

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<u>Application layer: </u>

When a client or user request to  a network the request initially comes to this layer.

On this layer we use tcp/ip protocol.

<u>System call interface(SCI): </u>

When application layer make a call to the kernel this layer handles that call. And take the request to the next layer.

<u>Protocol agnostic interface: </u>

This layer has two functions “talking” or “listening”. There is a thing called sockets which perform these functions and each socket has an id which is used specifically for an application.

<u>Network protocol: </u>

This layer is used for how the data is sent or received.

<u>Device agnostic interface: </u>

It is used to connect data from/to kernel user space and the network device drivers which allows the data to prepare itself for transmission over the medium from the network device.

<u>Physical hardware : </u>

This layer is responsible for the data packets transmission and received from the network medium being used whether cable or wireless.

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