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In x86, which of the following is not executed by itself ?
(A) cld
(B) rep
(C) std
(D) nop
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ans is D nop

A NOP is a computer instruction that does nothing apart from advance the program counter. It’s a waste of time and of the space it occupies in memory

Repeat instructions

REP: Repeat

Processor Control Instructions

STD, CLD: Set, clear   direction flag. 

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