question_answer

Let\[A=\{x,\text{ }y,\text{ }z\}\]and\[B=\{a,\text{ }b,\text{ }c,\text{ }d\}\]. Which one of the following is not a relation from A to B?

A)  \[\{(x,a),(x,c)\}\]

B)  \[\{(y,c),(y,d)\}\]

C)  \[\{(z,a),(z,d)\}\]

D)  \[\{(z,b),(y,b),(a,b)\}\]

E)  \[\{(x,c)\}\]