Which Metric Prefix(es) Listed Below Is(are) Correctly Assigned the Proper

Multiple Choice

Which metric prefix(es) listed below is(are) correctly assigned the proper power of ten?
I. giga:
10⁹
II. micro:
10⁶
III. nano:
10 ^{- 12}

A) I only
B) II only
C) III only
D) I and II
E) II and III