Which features are only supported with R81.10 Gateways but not R77.x?

Which features are only supported with R81.10 Gateways but not R77.x?
A . Access Control policy unifies the Firewall, Application Control & URL Filtering, Data Awareness, and Mobile Access Software Blade policies.
B . Limits the upload and download throughput for streaming media in the company to 1 Gbps.
C . The rule base can be built of layers, each containing a set of the security rules. Layers are inspected in the order in which they are defined, allowing control over the rule base flow and which security functionalities take precedence.
D . Time object to a rule to make the rule active only during specified times.

Answer: C