You are asked to consult on a Cisco Unity installation at the customer branch location. Users have slow access when they log on to Cisco Unity to retrieve their messages. At the branch location there are 2000 users on each of the two Cisco Unity servers and two Exchange servers. The call traffic is relatively low. There is never a time when all ports are busy on either Cisco Unity server. At headquarters there are two Cisco Unity servers, two Exchange servers, and a domain controller/global catalog server.How can you solve the issue at the branch location?

A.
The Exchange Optimizer application should be run on both messaging stores.

B.
An additional Exchange server should be added to the remote site.

C.
A domain controller/global catalog server with name resolution should be added to the remote site for authentication.

D.
More fiber-optic-level bandwidth should be added between the Cisco Unity servers and the Exchange servers.