What is the minimum number of partitions that must be defined given the dial-plan rules listed
below?
All employees can call local and service numbers.
Managers can call long-distance and international numbers.
Executives can call all PSTN numbers including premium numbers.
Only administrative assistants can call executives.

Incoming calls can only be routed to phones, not to trunks.

A.
3

B.
4

C.
5

D.
6

E.
7

F.
8