In which two ways does Cisco ensure security for a Cisco Unified Communications solution? (Choose two.)

A.
Cisco uses propriety protocols which protect against known vulnerabilities such as virus attacks, service attacks, and hackers.

B.
Cisco has a set of design guidelines and software services that, when implemented, will secure the network against known vulnerabilities such as virus attacks, service attacks, and hackers.

C.
Cisco Unified Communications solutions are always more secure than traditional phone systems.

D.
Because Cisco Unified Communications solutions are isolated from the data network, they are protected against known vulnerabilities such as virus attacks, service attacks, and hackers.

E.
Cisco Unified Communications Manager supports encrypted voice calls.