Which is TRUE regarding testing revenue transactions under ASC 606?

a. You are required to test the standalone selling price used by management to allocate the transaction price even if they did not estimate it and used the selling price charged for each item separately in similar circumstances to similar customers.

b. To maintain an efficient audit, you should make and send your revenue testing selections to the client for support prior to obtaining comfort over the completeness of the detailed listing of revenue for the period.

c. If management accounted for a variable consideration using the most likely amount method, email evidence stating that they are aware of the requirements for estimating the variable consideration and intend to meet them is sufficient evidence to test management's determination that it is probable.

d. You do not need to inspect the contract if the entity accounted for the selected transaction using their standard terms and conditions and did not flag any unusual terms.