A company wants to create an automation workflow to send notification for specific Threats. While creating the workflow, is it mandatory to use a Logic App?

Answer options:

A.No, to create automation workflow, Logic App is not mandatory
B.Yes, it is mandatory to use a Logic App while creating an automation workflow
C.No, there is no relation between Automation Workflow and Logic App
D.No, the Logic App has to be created after creating Automation Workflow

Answer: B 
Option A is incorrect because while creating the Automation Workflow, an existing Logic App has to be selected 
Option B is CORRECT as Logic App has to be selected while creating an Automation Workflow, please view the diagram below 
Option C is incorrect because Logic App is required during automation workflow creation 
Option D is incorrect because the Logic App has to be created prior creating automation workflow 
Diagram: 

Reference:

https://portal.azure.com