Fill in the blank: The _________ software blade enables Application Security policies to allow, block, or limit website access based on user, group, and machine identities.

The Application Control software blade is specifically designed to create and enforce Application Security policies that control access to applications and websites. It integrates with the Identity Awareness blade to apply rules based on user, group, and machine identities, making it the only blade that satisfies all conditions in the question.

Data Awareness is focused on detecting and controlling sensitive data in files and content, not on controlling website or application access by identity.

URL Filtering categorizes and filters URLs by category, but it does not natively define Application Security policies based on user, group, and machine identities - that is the role of Application Control.

Threat Emulation is a sandboxing blade that detects zero-day threats in files, and has no function related to identity-based application or website access policies.