When configure HSPR on IPv6 enabled interface, which two configuration is correct.

When configure HSPR on IPv6 enabled interface, which two configuration is correct.
A . switchA{config-if)» standbyt 6 preempt
B . switchA(config-if)» hsrp <group-number>
C . switchA(config-if)ff key 6
D . switchA{config-if)» hsrp version 2
E . switchA{config-if)B priority <level>

Answer: B