What is the correct order to implement call coverage?

You are the network administrator. What is the correct order to implement call coverage?
Exhibit:

A. (I) (II) (III) (V) (IV)
B. (IV) (I) (II) (III) (V)
C. (V) (IV) (i) (ii) (Hi)
D. (IV) (I) (II) (V) (III)