What are two valid reasons for deploying Panorama in High Availability?

An administrator wants to justify the expense of a second Panorama appliance for HA of the management layer.

The customer already has multiple M-100s set up as a log collector group .

What are two valid reasons for deploying Panorama in High Availability? (Choose two.)
A . Control of post rules
B . Control local firewall rules
C . Ensure management continuity
D . Improve log collection redundancy

Answer: C,D