What is dual IOS mode on the Cisco ASR 1001 Router?

What is dual IOS mode on the Cisco ASR 1001 Router?
A . redundant IOS processes that are running on the active RP and standby RP
B . active and standby IOS processes that are running on a single RP
C . separate Cisco IOS XE and IOS XR processes that are running on a single RP
D . separate Cisco IOS XE and IOS XR processes that are running on two different RPs
E . checkpointed redundant IOS processes that are running on two different RPs in active/active mode

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Answer: B