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, Op tion A (It ensures both Cloud App Control and URL Filtering Rules are applied) 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. It ensures both Cloud App Control and File Type Control Rules are applied: File Type Control classifies and restricts uploads or downloads by file type, regardless of filename tricks.

C. It ensures both Cloud App Control and Bandwidth Control Rules are applied: Cloud Application Control gives application-aware SaaS policy, including activity and tenant-aware restrictions.

D. It ensures both Cloud App Control and DLP Rules are applied: DLP rules combine detection conditions and policy logic; they are not the content-pattern library itself.