You have a server named Server1.
You open Server Manager on Server1 as shown in the exhibit. (Click the Exhibit button.)
You need to ensure that you can publish RemoteApp programs.
What should you do?
Exhibit:

A.
Create a Remote Desktop connection authorization policy (RD CAP).

B.
Install the Remote Desktop Gateway role service.

C.
Create a collection.

D.
Install the Remote Desktop Virtualization Host roleservice.

Explanation:
Without the exhibit, this is impossible.
Obviously an RD CAP isn’t right as this isn’t a RD Gateway scenario.
A RD Virt Host implies we are using a VDI pool and that doesn’t appear to be the case with a RemoteApp.
RD Gateway doesn’t appear to be in play here.
That just leaves to create a collection.
/shrug