Which two statements about HSRP, GLBP, and VRRP are true? (Choose two.)

Which two statements about HSRP, GLBP, and VRRP are true? (Choose two.)
A . HSRP is the preferred protocol to be used in multivendor environments
B . VRRP has one master router, one standby router, and many listening routers.
C . GLBP allows for a maximum of four MAC addresses per group.
D . HSRP supports up to 255 groups in the same switch or router
E . VRRP is a Cisco proprietary protocol.

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Answer: CD