A small organization with one project manager decides to transit from a traditional waterfall project management approach to agile. However, the relevant organizational personnel lack experience with agile methodologies. The organization has elected to use hybrid life cycles as a transition strategy. What else should be done to facilitate the transition?
选项：

A:Replace the existing project manager with an experienced external agile coach
B:Establish a directive project management office (PMO) to lead the transition
C:Eliminate the project manager's role entirely as agile teams are self-managing
D:Contract an external agile coach to assist the organization with the transition