In the Zero Trust Exchange functional services view, Antivirus belongs to the Security Services layer. That layer contains protective inspection capabilities such as antivirus, sandbox, firewall/security inspection, and related threat controls. Option C (Security Services) is correct because Antivirus is a security service, not a platform, access-control, or pure ATP-only category.

Why the other options are incorrect:

A. Platform Services: Platform Services provide shared foundations such as policy, identity, and logging. Antivirus belongs under the security-services protection layer.

B. Access Control Services: Access Control Services handle access, segmentation, and conditional controls. Antivirus is a threat inspection capability under Security Services.

D. Advanced Threat Prevention Services: Advanced Threat Prevention is a specific threat capability family. In the functional diagram, Antivirus is grouped more broadly under Security Services.