Which two phone security functions are available to this Cisco IP phone?

Refer to the exhibit.

Which two phone security functions are available to this Cisco IP phone? (Choose two.)
A. default Authentication of TFTP downloaded files using a signing key
B. encryption of TFTP configuration files using a signing key
C. encrypted call signaling but unencrypted call media
D. encrypted call media but unencrypted call signaling
E. encrypted call signaling and media
F. local trust verification on the phone