Magnitude comparator vs selector: Does a magnitude comparator output the highest or lowest numeric value of its inputs based on control signals, or is that the role of a different device?

Introduction / Context:
Combinational building blocks have specialized roles. A magnitude comparator takes two binary numbers and asserts flags indicating A > B, A = B, or A < B. A multiplexer or dedicated min/max selector, not the comparator, forwards one of the operand values to the output. Confusing these blocks causes functional errors in datapaths and control logic.

Given Data / Assumptions:

• Inputs are two binary words A and B.
• Magnitude comparator outputs are relational flags only.
• Selectors (MUX/min–max units) use flags or control lines to route values.

Concept / Approach:
A magnitude comparator does not drive out a numeric operand. It asserts logic-high on one or more of its relational outputs: A>B, A=B, AB is true, select A, else select B. Therefore, the statement that a comparator “outputs the highest or lowest value depending on control signals” incorrectly attributes selector behavior to the comparator itself.

Step-by-Step Solution:

Verification / Alternative check:
Review standard ICs: 74x85 outputs A>B, A=B, A

Why Other Options Are Wrong:
“Correct” contradicts device definitions. Bit-width or two’s-complement representation do not change the role separation; tri-state buses are unrelated to comparator core behavior.

Common Pitfalls:
Assuming any block that “compares” will also select; in modular design, comparison and selection are distinct steps wired together by control logic.

Final Answer:
Incorrect