Allow Cascading is a layered-policy behavior used when Cloud App Control and URL Filtering both need to evaluate the same transaction. Without cascading, an explicit Cloud App Control allow decision can effectively end processing for that transaction. With cascading enabled, the allowed cloud-app transaction is still passed to URL Filtering so URL category, risk, and isolation decisions can also be enforced. Therefore, Option A (Allow Cascading) is correct because it preserves both application-aware control and destination-category filtering in the same access decision.

Why the other options are incorrect:

B. Allow and Quarantine: Allow and Quarantine would mean access is permitted while content is held or remediated. That is not the feature name for letting URL Filtering run after Cloud App Control allows a transaction.

C. Allow URL Filtering: Allow URL Filtering describes the desired result in plain English. The platform feature name students need to know is Allow Cascading.

D. Allow and Scan: Allow and Scan is a scanning/sandbox-style idea. The Cloud App Control and URL Filtering handoff is specifically called Allow Cascading.