Which two statements describe characteristics of Cisco Unified Border Element high availability, prior to Cisco IOS release 15.2.3T, using a box-to-box redundancy configuration? (Choose two.) 

Answer options:

A. It leverages HSRP for router redundancy and GLBP for load sharing between a pair of routers.
B. Cisco Unified Border Element session information is check-pointed across the active and standby router pair.
C. It supports media and signal preservation when a switchover occurs.
D. Only media streams are preserved when a switchover occurs.
E. It can leverage either HSRP or VRRP for router redundancy.
F. The SIP media signal must be bound to the loopback interface.

BD

Configure box-to-box redundancy when you:Expect the behavior of the CSSs to be active/standby (only the master CSS processes flows)Can configure a dedicated Fast Ethernet (FE) link between the CSSs for the VRRP heartbeat Do not configure box-to-box redundancy when you:Expect the behavior of the CSSs to be active-active (both CSSs processing flows). Use VIP redundancy instead.Cannot configure a dedicated FE link between the CSSs.Require the connection of a Layer 2 device between the redundant CSS peers.