If a Company Is Using the Accrual Method of Accounting

If a company is using the accrual method of accounting, when is revenue recorded?

A) When cash is received, before the completion of the services
B) When cash is received, 30 days after the completion of the services
C) When cash is received, even though services may be rendered at a later date
D) When services are rendered, even though cash may be received at a later date