The "less than or equal to" comparison operator is __________.

A. !=
B. <<
C. <
D. <=
E. =<


D. <=

Computer Science & Information Technology

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will be generated by attempting which of the following?

The error message Index or primary key cannot contain a Null Value. (A) A user tries to enter a record in the table Countries that doesn’t contain data in the primary key. (B) A user tries to add a record to a table that is related to the Countries table, and that record contains a foreign key value that does NOT correspond to a primary key value in the Countries table. (C) A user tries to enter a record in the table Countries with the same primary key as another record. (D) A user tries to request a joined table using LINQ.

Computer Science & Information Technology

The main program is often called a client program because:

A. a client (computer user) uses the main program B. a class is often a client of a main program C. a single class can be used by many different main programs, so the class can be thought of as a service, while the main programs that use the service are clients D. special programmers, called clientia, write them

Computer Science & Information Technology

The mechanisms used to ensure file consistency may __________.

a) increase complexity b) restrict scalability c) reduce performance d) All of the above.

Computer Science & Information Technology

It is possible to change the size of the preview of a document in the Backstage view

Indicate whether the statement is true or false

Computer Science & Information Technology