a. The donor?
The donor obviously is not a good choice: in the event that the donor becomes mentally incapable, he/she probably will not be able to locate the whereabouts of the EPA, or it might even be locked in a safety deposit box to which the attorney does not have access without the EPA. It is possible that the attorney will never be able to get hold of the EPA and thus will not be able to assist in managing the donor’s financial affairs although he/she is supposed to do so.
It appears appropriate that even if the donor wants to keep the EPA in his/her own custody, he/she should at least let the attorney know where to find the EPA in case of the donor’s mental incapacity.