Which two describe the correct requirements for non-disruptive IOS ISSU on Cisco Nexus 7000 Series Switches?

Which two describe the correct requirements for non-disruptive IOS ISSU on Cisco Nexus 7000 Series Switches? (Choose two.)
A. updated kickstart and system images must be staged in bootflash on single-supervisor switches
B. updated kickstart and system images must be staged in bootflash on dual-supervisor switches
C. low version skew
D. dual supervisors
E. clock synchronization

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