Tim is the project manager for a shopping mall construction project which is in its fourth month of execution. According to the project contract, Tim can only issue project invoices when the project is 25%, 50%, 75% and 100% complete in terms of the approved project schedule. Recently the 25% milestone has been reached and Tim is ready to issue his first invoice. According to the contract, the project must be completed in 12 months. What is the project’s SPI?

0.25 0.75 0.33 1.33