In the multizone model with Prefix Dialing, what are suffixes and prefixes used for?

In the multizone model with Prefix Dialing, what are suffixes and prefixes used for?

A.
To ensure that location requests are always sent to every zone

B.
To be added to all numbers or aliases dialed by endpoints

C.
To prevent registration of devices by IP address

D.
To ensure that location requests are only sent to VCSs if the prefix or suffix matches