Explanation:
Both Primary Key and Candidate Key are the attributes that are used to access tuples from a table. These (Primary key and Candidate key) are also can be used to create a relationship between two tables.
- A Candidate Key can be any column or a combination of columns that can qualify as a unique key in the database. Each Candidate Key can qualify as a Primary Key.
- A Primary Key is a column or a combination of columns that uniquely identify a record. The primary key is a minimal super key, so there is one and only one primary key in any relationship.
<em> The main difference between them is that a primary key is unique but there can be many candidate keys. </em>
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Because of the reflection on the window or mirror.
Answer:
Option (4) is correct answer
Explanation:
IPsec stands for Internet protocol security. It is a protocol that works between two communication points. It provides integrity, confidentiality and data authentication for any network. It is used for Virtual private network. There are two types of VPN, From which an organization needs to choose one.
IPsec and OpenSSl in which IPsec VPN uses IP security.
Benefits of this network are as follows--
- Option 1 states that it works after the transport layer which is true.
- Option 2 states that when any user leaves the organization they have no need to take back the martial which he had already provided to the organization which is also the benefit of IPsec.
- Option 3 states that it provides security that is also correct because it is a protocol that is designed to provide security.
Hence option D (all of the above ) are correct.
Answer:
The right answer is option 2: instance variables and their values
Explanation:
Let us define what an object is.
An object is a blueprint of a real-world identity. The instances are the reference to the object. Multiple instances of an object type can be made.
The instance variables and their values help us to determine the state of the object.
Hence,
The right answer is option 2: instance variables and their values
Dir, attrib, cd, and rem are all examples of DOS Commands. dir command is used to display a list of files and folders contained inside your current folder. Attrib changes or views the attributes of one or more files. CD id for changing directory. rem<span> command is used to record comments in a script file.</span>
