HOTSPOT
You have a server named Servers that runs Windows Server 2012 R2. Servers has the Windows
Deployment Services server role installed.
Server5 contains several custom images of Windows 8.
You need to ensure that when 32-bit client computers start by using PXE, the computers
automatically install an image named Image 1.
What should you configure?
To answer, select the appropriate tab in the answer area.
Answer: 
Explanation:
Incorrect – Boot Tab specifies Default Boot images, which can be specified based on CPU and firmware architecture.
Boot tab specifies only what will automatically be highlighted, doesn’t tell the computer to go ahead with the install. Client tab has the same options but they are specified as answers to the query so the selection under x86 architecture counts as a selected and continues ahead.
Client tab=correct
Bas is correct as can be seen by this image.
http://deploymentresearch.com/Portals/0/Articles/WDSinWin8/WDS-ServerPropertiesClient.png
TestTaker is correct, guys. The Client tab is only used to specify the unattend file for each architechture. It does not specify the boot image at all. You do that in the Boot tab.
-> Client