The number of permutations of n different objects taken r at a time, where repetition is allowed is _______________

The number of permutations of n different objects taken r at a time, w

1.	The number of permutations of n different objects taken r at a time, where repetition is allowed is _______________
A.	n!
B.	r!
C.	<sup>n</sup>P<sub>r</sub>
D.	n<sup>r</sup>
Answer» E.