Answer:
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The main drawback of multiuser processing of a database is:
<h3>What is lost-update problem?</h3>
In the area of lost update problem, an update that has been carried on to a data item by a transaction is said to be lost as it is known to be overwritten by the update that has been carried on by another transaction.
Therefore, The main drawback of multiuser processing of a database is:
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Answer:
Proved
Explanation:
Given


Required
Find out why they represent the same
To do this, we simplify either
or 
In this question, I will simplify

Apply de morgan's law

Apply distribution property

To simplify, we apply the following rules:
--- Inverse law
--- Inverse law
So, the expression becomes


Rewrite as:

From the given parameters:

This implies that:
when simplified is X or 
Hello!
The considerations that go into representing data digitally is that the data can be easily sent and interprated to people all over the world. However, one of the trade-offs of representing data digitally is that the information loses a "human" aspect. Instead of experimenting the data, you are simply reading it.
I hope you found this helpful! :)
Answer:
During the middle of
Explanation:
Perfective maintenance usually is cost effective during the middle of the system.