You are performing an arithmetic operation and have placed the desired result type in parentheses followed by a variable to be cast with the result. What is this an example of?

In the accompanying figure, two messages displayed under one ____________________.

Fill in the blank(s) with the appropriate word(s).

?A ____ is a data network connection that makes use of the public telecommunications infrastructure but maintains privacy through the use of a tunneling protocol and security procedures.

A. ?NAT network B. ?TCP network C. ?DHCP D. ?virtual private network (VPN)