Implementing Cisco IP Switched Networks (SWITCH v2-0) (#551)

Which causes routers R1 and R2 to be displayed as HSRP active routers for group 2?

The HSRP group numbers do not match.
The HSRP group authentication misconfigured.
The HSRP group Hello packets are blocked.
The HSRP group timers do not match.
The HSRP group priorities do not match.