Citrix Exam 1Y0-312 Topic 2 Question 5 Discussion

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?