When the telecommunication manager state the exiting digital phone system is delivering various features, what would be an appropriate answer?

When the telecommunication manager state the exiting digital phone system is delivering various features, what would be an appropriate answer?

A.
Cisco Collaboration integrates the existing phone system seamlessly.

B.
Cisco Collaboration supports voice networks for much lower cost than the existing phone system.

C.
Cisco Collaboration is more than just telephony; it is an elevating solution that will change the way employees work and interact.

D.
Cisco Collaboration has many more features than existing phone systems that offer multiple benefits for a customer.