Which of the following statements are not true regarding functions?
Check all that apply.
A. A function is a relation in which each value of the input variable is
paired with at least one value of the output variable.
O
B. A sequence is a function whose domain is the set of natural
numbers.
C. The vertical line test may be used to determine whether a
function is one-to-one.
D. The horizontal line test may be used to determine whether a
function is one-to-one.