Scenario: A Citrix Engineer needs to make a change to the OS Layer. The OS Layer is currently used in several layered images that include different application layers.
Which two steps should the engineer take to make the necessary changes to the OS Layer and the layered images while minimizing administrative effort? (Choose two.)

Which three pre-requisites should a Citrix Engineer take into consideration when configuring Smart Card authentication in the Citrix Virtual Apps and Desktops environment? (Choose three.)

A SQL Database Administrator has been asked to create a backup policy for the Citrix Virtual Apps and Desktops databases.
Which three SQL databases does a SQL Database Administrator need to back up for a Citrix environment?
(Choose three.)

Scenario: A Citrix Engineer created four application layers with different applications at different time stamps as shown below:
App Layer A - Microsoft Office Professional - 15/08/2019, 14:28
App Layer B - Adobe Acrobat Reader and Cisco Webex - 14/07/2019, 11:45
App Layer C - Active Directory Users&; Computers, Citrix Studio -
20/08/2019, 16:10
App Layer D - Google Chrome and GoToMeeting - 27/07/2019, 10:35
Which layer would hold the highest priority in this scenario?

Scenario: A Citrix Engineer is working on an existing Citrix Virtual Apps and Desktops environment with two Delivery Controllers each in Primary zone and Secondary zone located in two different datacenters respectively. Due to an outage in the Primary zone datacenter, both Delivery Controllers in the Primary zone failed to start.
Which three statements will be true in this scenario? (Choose three.)