Final answer:
Option C: A Firewall is the security utility program that acts as a barrier between a computer network and potential harm by controlling network traffic based on security rules.
Step-by-step explanation:
The security utility program that provides a barrier between a computer network and harmful agents is a Firewall. A firewall monitors and controls incoming and outgoing network traffic based on predetermined security rules. It establishes a barrier between a trusted internal network and untrusted external networks, such as the internet, to prevent unauthorized access to or from the network. Unlike a Defragmenter, which optimizes disk space, or a Cleaner, which removes unused files, or Data Encryption, which protects data by converting it into a coded form, a firewall specifically focuses on network security.
A security utility program that provides a barrier between a computer network and harmful agents is a firewall. A firewall monitors incoming and outgoing network traffic and allows or blocks specific traffic based on predetermined security rules. It acts as a protective barrier, preventing unauthorized access to a network and protecting sensitive data from potential threats.