A customer wants to deploy the Cisco Business Ready Teleworker solution, but is currently using a traditional (non-IP) PBX for voice services. What would you recommend to this customer?（）

• A、Deployment of Business Ready Teleworker with VoIP is not recommended.
• B、The customer’s existing PBX must first be replaced with Cisco IP Telephony solution.
• C、Business Ready Teleworker and Cisco IP Telephony can be deployed in parallel to the existing PBX， integrating the two with trunking.
• D、Deployment is recommended only for full-time Teleworkers who have no other corporate phone.