Revenue is properly recognized:

A) When the customer's order is received.
B) Only if the transaction creates an account receivable.
C) At the end of the accounting period.
D) Upon completion of the sale or when services have been performed and the business obtains the right to collect the sales price.
E) When cash from a sale is received.

Revenue should be recognized when the business has completed the sale or performed services and obtained the right to collect payment. This is known as the "revenue recognition principle" in accounting. Recognition of revenue is not dependent on the receipt of cash or the creation of an account receivable. It should not be delayed until the end of the accounting period. The customer's order alone does not represent the completion of a sale, and therefore should not trigger revenue recognition.