A company plans to implement the Cisco Unity Unified Messaging solution over the coming months. The Cisco Unity system will be installed at the main office and will integrate with Cisco Unified CallManager V5.0. It must work with the existing VPIM-compatible voice-mail systems at the three branch locations until they are converted to Cisco Unity, one at a time. Cisco Unity will be using a centralized call-processing and a centralized messaging-deployment model. There are 75 employees at each branch location. The IT department expects the process to take three months. They want all subscribers and outside callers to be able to address voice messages to all employees as soon as Cisco Unity is implemented.

What is the best way to accomplish this goal?

A.
All main office employees are created as Cisco Unity subscribers and all branch office employees are created as VPIM subscribers. Branch employee accounts are rebuilt, one at a time, into Cisco Unity subscribers.

B.
All main office employees are created as Cisco Unity subscribers and all branch office employees are created as VPIM subscribers. At the appropriate time, the Bulk Subscriber Import tool is used to convert the branch employee accounts.

C.
Main office employees are created as Cisco Unity subscribers and all branch office employees are created as VPIM subscribers. At the appropriate time, the Migrate Subscriber Data tool is used to convert the branch
employee accounts.

D.
All employees are created as Cisco Unity subscribers, calls are automatically transferred and voice messages are automatically forwarded to subscribers at the branch locations. No conversion is necessary when the branch locations are brought online.