You have outsourced a portion of the project to a seller, the work includes review and subsequent modifications for your project. The seller has discovered some basic architectural issues that will influence the cost and schedule of the project. How must the seller and you update the agreement?

a) Submitting the change request to the contract change control system.
b) Submitting the change request to the schedule change control system.
c) Sign the new contract.
d) Identify it is a risk and inform the sponsor.