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Q1 Single choice

In preparation for a maintenance task, an LTM Specialist performs a "Force to Standby" on LTM device Unit 1. LTM device Unit 2 becomes active as expected. The maintenance task requires the reboot of Unit
1. Shortly after the reboot is complete, the LTM Specialist discovers that Unit 1 has become active and Unit 2 has returned to standby.

What would cause this behavior?

A
Unit 1 is set with the redundancy state preference of active in devices groups.
B
Unit 1 is set with the redundancy state preference of active in high availability.
C
A traffic group is configured with Auto Failback, and Unit 1 is the default device.
D
A device group is configured with Auto Failback, and Unit 1 is the default device.

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