Which of the following statements are correct?

1.Keys such as Ctrl, Shift and Alt are called modifier keys

2.Arithmetic, logical, input-output operations and data manipulation are functions of the CPU

3.The instructions for starting the computer are stored on a read-only memory chip

A2 and 3

B1, 2 and 3 ✓ Correct

C1 and 3

D1 and 2

Correct answer: (B) 1, 2 and 3

Explanation

All three statements are correct.

Statement 1 rightly calls Ctrl, Shift and Alt modifier keys.

Statement 2 correctly lists arithmetic, logical, input-output and data-manipulation tasks as functions of the CPU.

Statement 3 rightly says the startup instructions are stored on a read-only memory chip.

Modifier keys change the action of other keys when held together with them.

The startup routine kept in read-only memory is often called the BIOS.

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