Consider the two groups listed below. which statement describes the sets?

• house

• complete mailing address

a) the relation (house, complete mailing address) is a function, but the relation (complete mailing address, house) is not

b) the relation (complete mailing address, house) is a function, but the relation (house, compete mailing address) is not

c) both (house, complete mailing address) and (complete mailing address, house) are functions.

d) neither the relation (house, complete mailing address) nor the relation (complete mailing address, house) is a function.