Suppose you have an 8-bit binary number N. Which of the following operations does not change its lower 4 bits?

Suppose you have an 8-bit binary number N. Which of the following operations does not change its lower 4 bits?

a) An exclusive logical sum of N with 0Fh
b) A logical product of N with 0Fh
c) A negative logical product of N with 0Fh
d) A logical sum of N with 0Fh

From the Combined Bank Assistant Programmer (CSE) March 2021 – Preliminary exam, question 31 of 86.

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