A building contractor has a fixed$-$price contract to construct a building on the customer$$s land. The building is expected to be completed in $2$ years. Progress billings will be sent to the customer at quarterly intervals. Which of the following describes the preferable point for revenue recognition for this contract if its outcome can be reasonably measured?

A$.$As and only to the extent of costs incurred.

B$.$As progress is made toward completion of the contract.

C$.$After the contract is signed.

D$.$As cash is received.