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