Answer: A - A member of the Project Board should have authority and credibility, be available, and be able to delegate.
Key takeaway: A project board member should have the authority and the credibility to represent their interests and be able to assign resources when necessary. Beyond that, they should be available to deal with project issues as they arise. Ideally, this availability will be for the length of the project, but while continuity is good, it is not unknown for the same role to be filled by different people at different points in the project.