Correct option is D
In contractual payments,
RA Bill refers to a
Running Account Bill. This is an interim payment method used in construction and other contract-based projects where the contractor is paid for the work completed during a specific period, typically monthly. The contractor submits an RA Bill to the client, showing the value of the work completed so far. This bill is certified by the project engineer or supervising authority before the payment is made. The RA Bill system ensures a steady cash flow for the contractor, preventing delays in project progress due to financial constraints.