Which two statements about HSRP, GLBP, and VRRP are true?

A.	HSRP is the preferred protocol to be used on 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 on the same switch or router.
E.	VRRP is a Cisco proprietary protocol.