Scenario: A Citrix Administrator is configuring a Citrix ADC high availability (HA) pair with an existing primary Citrix ADC with all resources configured. The administrator adds the secondary Citrix ADC in HA and discovers that the configuration on the existing primary was removed and is now the secondary Citrix ADC in the HA pair.
Which two configurations could the administrator have used to prevent this from happening? (Choose two.)
To prevent the configuration change that was observed, the administrator should have ensured that the primary Citrix ADC is set to remain primary, and the secondary Citrix ADC is set to remain secondary. This setup ensures that there is no automatic failover or role reversal that could lead to the unintentional demotion of the primary device and loss of its configuration. Setting devices to stay in their designated roles stabilizes the high availability pair and maintains the desired primary-secondary relationship between the two devices.
right answer : https://docs.citrix.com/en-us/citrix-adc/current-release/system/high-availability-introduction/configuring-high-availability.html
I've actually seen this happen becuase A and B were not selected.