A contractor works on a cost$-$reimbursable $($CR$)$ contract when the client decides to expand the scope of services and change to a fixed$-$price $($FP$)$ contract. All the following are the seller's options except:

a$.$ Completing the original work on a cost$-$reimbursable basis and then negotiating a fixed price for the additional work

b$.$ Completing the original work and rejecting the additional work

c$.$ Starting over with a new contract

d$.$ Negotiating a fixed$-$price contract that includes all the work