Atype of fabric cost $2.49 per yard. in a relation, the input is the number of yards of fabric and the output is the cost. is this relation a function? why or why not? a. no, because different inputs (numbers of yards of fabric) will have different outputs (costs). b. no, because the fabric always costs $2.49 per yard. c. yes, because fabric can cost different amounts. d. yes, because one input (number of yards of fabric) will always have the same output (cost)