Which four statements are correct regarding MSDP configurations and operations? (Choose four.)
A. The MSDP peers are also typically the RPs in respective routing domains.
B. SA messages are flooded to all other MSDP peers without any restrictions
C. On Cisco IOS, IOS-XE, and IOS-XR, the router can be configured to cache the SA messages to reduce the join latency
D. SA messages are used to advertise active sources in a domain
E. MSDP establishes neighbor relationships with other MSDP peers using TCP port 639
F. MSDP peerings on Cisco IOS, IOS-XE, and IOS-XR support MD5 or SHA1 authentication
