Use the following sets to complete the given statements in as many ways as possible:
A = {a, b, c, d}
B = {e , f}
C = {b ,a , c, d}
D = {1 , 2 , 3, 4}
a. Sets _____and____are not equivalent and not equal.
b. Sets_____and____are not equivalent but are equal.
c. Sets_____and ____are equivalent but not equal.
d. Sets_____and____are equivalent and equal.