Which of the following statements are true regarding functions?

A. True. If it is possible to pass a single horizontal line through more than one point on the function curve, then the function is not one-to-one (it fails the horizontal line test).

B. True. Any given input must lead to exactly one output.

C. False. The vertical line test is used to determine if a relation is a function or not.

D. False. The domain of a sequence is the set of natural numbers {1, 2, 3, ...}

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In summary, the answers are A and B