Which feature in Cisco WebEx is the most important differentiator compared to other vendor in the collaboration technology? Select exactly 1 answer(s)from the following:
A. Cisco WebEx is always installed on- premises.
B. With an account, everyone can join Cisco WebEx meetings.
C. Cisco WebEx could be installed or collocated with Cisco Unified Communications Manager.
D. Web conferencing service is delivered over a proprietary network, which is optimized for security, performance, and reliability.
