Which four methods can be used to protect IP phones? (Choose four.)
A.
Use a firewall with the Cisco Unified Communications Manager cluster to prevent attacks from inside and outside the organization.
B.
Dedicate a TFTP server for each voice network segment.
C.
Prevent/Restrict/Disable GARP.
D.
Disable the Settings button.
E.
Disable the PC port.
F.
Use signed loads.