Which feature is supported with an In-Service Software Upgrade on a Cisco Nexus 9000 Series Switch?

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Which feature is supported with an In-Service Software Upgrade on a Cisco Nexus 9000 Series Switch?
A . configuration changes during an upgrade
B. nondisruptive upgrades via nonstop forwarding
C. zero downtime downgrades via dual supervisor modules
D. upgrades to Individual modules and line cards

Answer: B