please help with accounting,,,thank you

Indicate the account(s) closed at the end of an accounting period Select one: a. Billings, but not Construction in Process b. Construction in Process, but not Billings c. Both Billings and Construction in Process d. Neither Billings nor Construction in Process Under the percentage-of-completion method: Select one: a. Revenue, cost, and gross profit are recognized during the production cycle. b. Revenue and cost are recognized during the production cycle, but gross profit recognition is deferred until the contract is completed. c. Revenue, cost, and gross profit are recognized at the time the contract is completed. d. Gross Profit is recognized during the production cycle, but net losses are delayed until the contract is completed