What type of packet does a VPN-1 SecureClient send to its Policy Server, to report its Secure Configuration Verification status?

What type of packet does a VPN-1 SecureClient send to its Policy Server, to report its Secure Configuration Verification status?

A.
ICMP Port Unreachable

B.
TCP keep alive

C.
IKE Key Exchange

D.
ICMP Destination Unreachable

E.
UDP keep alive