Answer:
Recognize revenue when service is performed.
Step-by-step explanation:
Revenue recognition principle is an accounting principle which states that revenue should only be recognized when it is earned(when service has been rendered or completed) and not when cash is being collected.
What the above means is that revenue can only be earned when services are completed or rendered and not necessarily when payment is made. The reason is that payment may not be made for several weeks even after service has been rendered hence the principle or concept is incorporated into the accrual basis of accounting.