Which two statements are correct when performing a unified ISSU? (Choose two.)

Which two statements are correct when performing a unified ISSU? (Choose two.)
A . The master Routing Engine and backup Routing Engine must be running the same software version before you can perform a unified ISS
C . Unicast RPF-related statistics are not saved across a unified ISSU, and the unicast RPF counters are reset to zero during a unified ISS
E . Unicast RPF-related statistics are saved across a unified ISSU, and the unicast RPF counters are not reset to zero during a unified ISS
G . The backup Routing Engine must be running the most recent software version before you can perform a unified ISS

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Answer: A,D