what is a feature of cisco OfficeExtend?

A.
It allows a user to roam securely across networks

B.
It helps to ensure that certain devices, such as baby monitor and voice over wi-fi, can coexist in the wireless spectrum

C.
It extends an office phone number to a home telephone line

D.
It allows users to be connected to the office on mobile devices without having to log in to the vpn.

Explanation: