Explanation
https://docs.citrix.com/en-us/citrix-adc/current-release/networking/access-control-lists-acls/extended-acls-and-ex By binding a multiple SAN certificate, we only need to adapt the DNS entries of the websites to point to the same IP (1 IP with 3 DNS) and we will be able to forward the requests to any backend server since all of them are serving the same content.

Explanation/Reference: https://support.citrix.com/article/CTX122921

Explanation
answer: A. Set the primary Citrix ADC to stay primary in the Configure HA Node settings and B. Set the secondary Citrix ADC to stay secondary in the Configure HA Node settings.
Short Explanation with reference:
When configuring a Citrix ADC high availability (HA) pair, the administrator can use the Configure HA Node settings to specify the preferred role of each node in the pair, either primary or secondary. This can prevent unwanted failovers or configuration synchronization issues, such as the one described in the scenario. By setting the primary Citrix ADC to stay primary and the secondary Citrix ADC to stay secondary, the administrator can ensure that the existing configuration on the primary node is preserved and replicated to the secondary node, and that the roles of the nodes are not reversed. The stayprimary and staysecondary options can be enabled or disabled by using the -stayPrimary and -staySecondary parameters in the CLI or by checking or unchecking the Stay Primary and Stay Secondary check-boxes in the GUI.
Therefore, the correct answer is A. Set the primary Citrix ADC to stay primary in the Configure HA Node settings and B. Set the secondary Citrix ADC to stay secondary in the Configure HA Node settings.
Configuring high availability node parameters | NetScaler