A relation $R$ from $A$ to $B$ qualifies as a function when:
AEach element of $A$ relates to exactly one element of $B$ here
BEach element of $B$ relates back to exactly one element in $A$
CSome elements of $A$ may relate to two elements of $B$ together
DEach element of $A$ is in the relation $R$ multiple times
Answer & Solution
Correct answer: A. Each element of $A$ relates to exactly one element of $B$ here
A function maps each domain element to exactly one codomain element.
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