Answer:
A. when cash is received, either prior to, at the time of, or after the services are performed
Step-by-step explanation:
According to the cash basis accounting, the revenue should be recorded when the cash is received either before or at the time or even after the services are performed
Whenever cash is received it should be recorded in the books of accounts it can be any time before,at the time or even after
Hence, the option A is correct