Are Prepaid Amounts Received from Customers Treated as Revenue at the Time

Are prepaid amounts received from customers treated as revenue at the time of receipt? Why or why not?

A) Yes they are treated as revenue at the time of receipt because the company has access to the cash.
B) No the amount of revenue cannot be adequately determined until the company completes the work.
C) Yes The intent of the company is to perform the work and the customer is confident that the services will be completed.
D) No revenue cannot be recognized until the work is performed.