You have been assigned as the project manager with a team of seven. You seek to identify project roles and distinguish key responsibilities for project team members. The four plan$-$driven project executive$-$level roles are:

a$.$ The project manager, functional manager, steering team, and the project management office.

b$.$ The project manager, functional manager, facilitator, and the customer.

c$.$ The sponsor, customer, steering team, and the project manager.

d$.$ The sponsor, customer, steering team, and the project management office.