What is the maximum length of any numeric geographic area address in ITU recommendation E.164?

A.
15

B.
18

C.
21

D.
22

E.
25

Explanation:
E:
164 defines a general format for international telephone numbers. Plan- conforming
numbers are limited to a maximum of 15 digits. The presentation of numbers is usually
prefixed with the character + (plus sign), indicating that the number includes the international
country calling code (country code), and must typically be prefixed when dialing with the
appropriate international call prefix, which is a trunk code to reach an international circuit from
within the country of call origination.