(a) General. You have investment discretion when you have, with respect to a fiduciary account, the sole or shared authority to determine what securities or other assets to purchase or sell on behalf of that account. It does not matter whether you have exercised this authority.

(b) Delegations. You retain investment discretion if you delegate investment discretion to another. You also have investment discretion if you receive delegated authority to exercise investment discretion from another.