Which statement describes the key security service that is provided by the TLS Proxy function on a Cisco ASA appliance?

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Which statement describes the key security service that is provided by the TLS Proxy function on a Cisco ASA appliance?

A. It provides interworking to ensure that external IP phone traffic is encrypted, even if the rest of the system is unencrypted.
B. It only applies to encrypted voice calls where both parties utilize encryption.
C. It manipulates the call signaling to ensure that all media is routed via the adaptive security appliance.
D. It enables internal phones to communicate with external phones without encryption.
E. It protects Cisco Unified Communications Manager from rogue soft clients and attackers on the data VLAN.