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