Refer to the exhibit.

Which certificate file contains the private key used to sign the TFTP configuration file for download
authentication with Initial Trust List enabled IP phones?

A.
PUB.pem tomcat-trust trust-cert

B.
SUB.pem CallManager-trust trust-cert

C.
CAPF.pem CAPF cert

D.
TVS.pem TVS cert

E.
CallManager.pem CallManager cert