What do you need to do before you can use an Application-based trigger in your flow?

What do you need to do before you can use an Application-based trigger in your flow?
A . Activate application trigger spoke
B . Activate trigger security rules
C . Activate application spoke, and plug-ins as needed
D . Assign Application trigger role [sn_app_trigger_write] to SME
E . Activate application plugins only

Answer: B