Which of the following statements is true?

1. AControl memory is part of the hardwired control unit.
2. BProgram control instructions are used to alter the sequential flow of the program.
3. CThe register indirect addressing mode for accessing memory operand is similar to displacement addressing mode.
4. DCPU utilization is not affected by the introduction of Interrupts.

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Correct answer: B. Program control instructions are used to alter the sequential flow of the program.

Explanation

Program-control instructions (branch, jump, call) change the sequential flow. Control memory belongs to microprogrammed control, register-indirect differs from displacement, and interrupts do affect CPU utilization.