Which two solutions can the administrator use to scale this configuration?

An administrator plans to deploy 15 firewalls to act as GlobalProtect gateways around the world Panorama will manage the firewalls.

The firewalls will provide access to mobile users and act as edge locations to on-premises infrastructure. The administrator wants to scale the configuration out quickly and wants all of the firewalls to use the same template configuration

Which two solutions can the administrator use to scale this configuration? (Choose two.)
A . variables
B . template stacks
C . collector groups
D . virtual systems

Answer: A,B

Explanation:

https://docs.paloaltonetworks.com/panorama/10-0/panorama-admin/panorama-overview/centralized-firewall-configuration-and-update-management/templates-and-template-stacks

https://docs.paloaltonetworks.com/panorama/10-1/panorama-admin/manage-firewalls/manage-templates-and-template-stacks/configure-template-or-template-stack-variables.html