Which of the following is not recommended to protect against hardware failure?

Answer the following statements true (T) or false (F)

1. SQL uses a grid to select query records. 2. QBE uses a series of words and commands to select the rows and columns for a query. 3. The foremost concern when designing from an HCI perspective will always be assisting a user in accomplishing a task, set by the organization, with the use of technology. 4. No special skills are required of the user who interfaces with the computer using natural language.

In the readers/writers problem, cascading in readers ________.

a) forces all arriving threads to wait b) continues until all waiting readers have become active c) allows waiting readers to become active as soon as another reader finishes d) all of the above

By saving an existing Office file with the ____ command, you create a duplicate that you can modify, while the original file remains intact.

A. New B. Rename C. Duplicate D. Save As

Does the ?nal structure of a B + tree depend on the order in which the items are added to it? Explain your answer and give an example.

What will be an ideal response?