what reason would you configure multiple security contexts on the ASA firewall?

For what reason would you configure multiple security contexts on the ASA firewall?

A.
To separate different departments and business units.

B.
To enable the use of VRFs on routers that are adjacently connected.

C.
To provide redundancy and high availability within the organization.

D.
To enable the use of multicast routing and QoS through the firewall.