How do you configure a solution to ensure the email includes the case ID for the survey?

A survey is sent to a customer via email .

How do you configure a solution to ensure the email includes the case ID for the survey?
A . Create a required field for the case ID that must be entered by a user during the case process prior to sending the survey.
B . Delegate a business rule so representatives can customize the email content as needed on a case-by case basis.
C . Use the Insert Property feature of a Send Email step to add the case ID when composing the message dialog.
D . Create a process using the Send Email step allowing representatives to quickly add the case ID to the email.

Answer: C