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.

Explanation:
BD
You can partition a single ASA into multiple virtual devices, known as security contexts. Each context is an
independent device, with its own security policy, interfaces, and administrators. Multiple contexts are similar to
having multiple standalone devices.
Common Uses for Security Contexts
+ You are a service provider and want to sell security services to many customers. By enabling multiple security
contexts on the ASA, you can implement a cost-effective, space-saving solution that keeps all customer traffic
separate and secure, and also eases configuration.
+ You are a large enterprise or a college campus and want to keep departments completely separate.
+ You are an enterprise that wants to provide distinct security policies to different departments.
+ You have any network that requires more than one ASA.
Source: http://www.cisco.com/c/en/us/td/docs/security/asa/asa84/configuration/guide/asa_84_cli_config/
mode_contexts.html