What is true for the process of scope validation?

a$.$ Insufficient documentation is not a reason to reject deliverables, as long as in all other respects they are built according to specifications agreed upon.

b$.$ The project team members must achieve acceptance of the deliverables. This process is coordinated and documented by the project management team.

c$.$ It is the project management team's responsibility to obtain stakeholder's formal acceptance of the completed project scope and deliverables.

d$.$ Formal acceptance will finally reconcile all inconsistencies among deliverables and documents that where caused by bad change control and scope creep.