Why does an OpenVMS system with both internal and external users need to be protected by a
hardware firewall?

A.
the firewall translates between big and littleendian data in the network packets

B.
to prevent usage of the OpenVMS system as a spam relay

C.
to protect the OpenVMS system against network threats such as aDoS attack

D.
the firewall caches requests when the OpenVMS system is overloaded