Which two technologies can be implemented to reduce disruptions to the network during the upgrade?

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Due to a major version change, an engineer must perform a software upgrade on a Cisco Nexus Series switch.

Which two technologies can be implemented to reduce disruptions to the network during the upgrade? (Choose two.)
A . vPC
B . HSRP
C . VDC
D . MLAG
E . PAgP

Answer: AC