The scaling tool offers a low-cost automation solution for the customers who are looking towards optimizing their session host Virtual Machine costs. It uses several tools or apps like PowerShell runbook, Azure Automation account, the Azure Logic App, and a webhook to work. What happens when the scaling tool runs?

Answer options:

A.Azure Automation runbook calls a webhook to start the Azure Logic App. The App then creates a job.
B.A webhook is called by Azure Logic App to start/initiate the Azure Automation runbook. Then, the Azure Automation runbook generates a job.
C.Azure Automation runbook calls an Azure Logic App to start the webhook. The webhook then creates a job.
D.A webhook calls an Azure Automation runbook to start the Azure Logic App. The App then creates a job.

Correct Answer: B 
The scaling tool utilizes tools or apps like a PowerShell runbook, Azure Automation account, the Azure Logic App, and a webhook to function. When the Scaling tool runs, a webhook is called by Azure Logic App to start/initiate the Azure Automation runbook. Then, the Azure Automation runbook then generates a job.
Option A is incorrect. When the Scaling tool runs, a webhook is called by Azure Logic App to start/initiate the Azure Automation runbook. Then, the Azure Automation runbook then generates a job.
Option B is correct. When the Scaling tool runs, a webhook is called by Azure Logic App to start/initiate the Azure Automation runbook. Then, the Azure Automation runbook then generates a job.
Option C is incorrect. It is the Azure Logic App that calls a webhook for starting the runbook. Then runbook creates a job.
Option D is incorrect. Webhook is called by Azure Logic App to start the runbook.
Reference: To know more about Scale session hosts using Azure Automation, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/virtual-desktop/set-up-scaling-script