Universal Containers wants Field Technicians to capture customer authorization via a signature through Salesforce mobile

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Universal Containers wants Field Technicians to capture customer authorization via a signature through Salesforce mobile app.What should a Consultant recommend?

A. Create a Quick Action on the Service Appointment to launch a Visualforce signature page.
B. Create an Approval Process from the Service Appointment for the customer's Authorization.
C. Create a checkbox on the Service Appointment that will capture the customer's Authorization.
D. Create a custom text field to capture the customer's signature on Salesforce mobile app.