Which change was made to the port group that is causing the ARP table issue?

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An administrator receives notice of a large number of ARP table issues. The issues began after a
maintenance window 36 hours ago. The issue did not exist prior to the maintenance window.
Which change was made to the port group that is causing the ARP table issue?

A.
Notify Switches was changed to No.

B.
Uplink 2 was changed from Standby to Active.

C.
Failback was changed to Yes.

D.
Network failure detection was changed to Link status only.