Which of the following statements are true regarding functions?
 A.The horizontal line test may be used to determine whether a function is one-to-one.
 B.A function is a relation in which multiple values of the input variable are paired with at least one of the output variable.
 C.The vertical line test may be used to determine whether a relation is a function.
 D.A sequence is a function whose domain is the set of rational numbers.
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