Which entity signs a Cisco IP phone LSC?

A.
Godaddy.com Enrollment Server

B.
Manufacturer Certificate Authority

C.
Registration Authority

D.
Certificate Authority Proxy Function

E.
Cisco Certificate Authority

Explanation:
By default, LSC certificates are not installed on Cisco IP phones. Cisco IP phones
that are required to use LSC certificates must be provisioned to allow TLS transactions before
deployment in the field. LSC certificates can be provisioned to the Cisco IP phones through the
Certificate Authority Proxy Function (CAPF) process. This process is completed using TLS and
USB tokens coupled with the CTL client. Moreover, the Cisco ASA Phone Proxy feature can serve
LSC certificates to the Cisco IP phones. Cisco IP phones will only work with the Cisco ASA Phone
Proxy and will not establish secure connectivity with the Cisco Unified Communications Manager.