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 internationaltelephone 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 internationalcountry calling
code(country code), and must typically be prefixed when dialing with the appropriateinternational
call prefix, which is atrunk codeto reach an international circuit from within the country of call
origination.