Final answer:
The correct answer is Option C. A list of applications approved for use on a network is called a white list. It is a security measure that permits only authorized entities and blocks unapproved ones to safeguard the network.
Step-by-step explanation:
A list of applications that are approved for use on a network is known as a white list. This term refers to a security approach where only authorized software, email addresses, users, or other entities are given permission to be active or present on a system or network. When a whitelist is in use, all other unapproved applications or entities are typically blocked by default, increasing the network's security against unauthorized access or malicious software.