Lena Construction Company's projects extend over several years, and collection of receivables is reasonably certain. Each project has a contract that specifies a price and the rights and obligations of all parties. Both the contractor and the customer are expected to fulfill their contractual obligations on each project. Reliable estimates can be made of the extent of progress and cost to complete each project. Which of the following methods should the company use to account for construction revenue?

a$.$

Installment sales method

b$.$

Completed contract method

c$.$

Percentage of completion method

d$.$

Cost recovery method