A customer is asking about a solution that would allow end users to make changes to their subscriber options. They have over 500 sales people traveling worldwide and 300 support personnel at the…

A customer is asking about a solution that would allow end users to make changes to their subscriber options. They have over 500 sales people traveling worldwide and 300 support personnel at the company's headquarters. They have a three Messaging Application Server (MAS) system, with all three MASs in the voice mail domain. MAS 1 is running mailbox monitor, Call Me, and Message Waiting Indicator (MWI) services. MAS 3 is used for the tracing and report server. They also have a customer provided Web Client Server. On which server can the Web Subscribe Option run?