Which of the following is a recommended best practice for implementing agile software development?

A) a product owner with contractual authority to remove or add a feature into the product or service.

B) a contracting officer is a representative with authority to make calls and schedule adjustments for deliverables.

C) a financial specialist with contractual authority to adjust the schedule delivery date.

D) a lead systems, engineer with the requisite authority and technical understanding to adjust a performance metric.