Which option is an online conferencing solution that allows participants to see; hear and share content and applications in real time?

Which option is an online conferencing solution that allows participants to see; hear and share
content and applications in real time?

A.
Cisco Unity

B.
Cisco ISR with Conferencing service module

C.
Borderless Networks

D.
WebEx meetings

Explanation:
http://www.webex.com/how-to/