The project manager identified the need for two additional application architects.

These positions were not included in the original project budget. The project manager communicated the need for the architects in a conversation with the project sponsor. During the conversation, the project sponsor verbally approved the two roles. During a budget review, one month after the two application architects had begun work on the project, the project sponsor was surprised to learn that the project had added two additional roles.

What should the project manager have done?

A. Changed the baseline budget to reflect the two additional roles.
B. Documented the two additional roles in the project status report.
C. Obtained written confirmation from the project sponsor to add the two additional roles.
D. Reminded the project sponsor of the two additional roles by leaving a voice mail message.