You work as a network consultant at YourDomain .com. One of your clients has multiple global call centers. This client now wants to reduce costs and improve customer service.
What Cisco solution best meets the requirement for this client?

A.
Routing and Remote access (RRAS)

B.
Internet Protocol (IP) telephony

C.
Wireless local-area network (WLAN)

D.
Storage-area network (SAN)

E.
Virtual Private Network (VPN)