Question

The instructions that involve various string manipulation operations are

• A. branch instructions
• B. flag manipulation instructions
• C. shift and rotate instructions
• D. string instructions

Hint:

String instructions handle arrays/strings efficiently.

Answer 1

The Correct Option is D

Step 1: Sort instructions by what they operate on.
Processor instruction sets are usually grouped by purpose, branch instructions redirect program flow, flag instructions manipulate individual status bits, and shift or rotate instructions move bits within a single register.
Step 2: Notice the gap these categories leave.
None of those groups are designed to work on a whole block of consecutive memory locations at once, such as copying, comparing, or scanning a sequence of bytes.
Step 3: Identify the category built for that job.
String instructions, such as move string, compare string, and scan string, are specifically designed to repeatedly operate on successive memory locations, which is exactly what string or block manipulation requires.
\[ \boxed{\text{string instructions}} \]