正解:A,B,C
The question is asking for the free basic Wildfire Service which only allows for PE (Portable executables) files.
pe
Portable Executable (PE) files. PEs include executable files, object code, DLLs, FON (fonts), and LNK files. A subscription is not required to forward PE files for WildFire analysis, but is required for all other supported file types.
"With the basic WildFire service, the firewall can forward portable executable (PE) files for WildFire analysis", look online for PE files and you will get:
.acm, .ax, .cpl, .dll, .drv, .efi, .exe, .mui, .ocx, .scr, .sys, .tsp
https://docs.paloaltonetworks.com/wildfire/10-0/wildfire-admin/wildfire-overview/wildfire- concepts/file-analysis.html