What are ‘unmanaged endpoints” which make the ProxyRA appliance useful?

A.
TCP connection sources of destinations, which are outside our LAN

B.
Workstations, which need to be in a virtual private network, but VPN clients cannot be installed
on them

C.
TCP and UDP ports that are unprotected by the enterprise firewall.

D.
Hosts without ProxyClient installed on them.

Explanation: