Which of the following best defines an output? a. an output is the value that determines another based on the relation or the function rule, usually the x-values in a set of ordered pairs or on a table or graph. b. an output is the result of a relation or the function rule, usually the y-values in a set of ordered pairs or on a table or graph. c. an output is a special type of relation for which there is a rule that pairs each input with exactly one output. d. an output is a set of ordered pairs in which no y-value repeats.