Save you more offers a buy one/get one free item each week. customers who purchase only one of the items must pay the regular price. the limit is one deal per customer. is the relation (# sale items purchased, price) a function? why or why not? a) it is a function because the input can be either 1 or 2 items, but the output will always be the same price. b) it is not a function because the input can be either 1 or 2 items, but the output will always be the same price. c) it is a function because the input will always be the same price, but the output can be either one or two items. d) it is not a function because the input will always be the same price, but the output can be either one or two items.