Any donor may, with respect to a gift made by such donor to the corporation and within such limits of policy as the corporation from time to time may declare in writing, give directions in the instrument of gift or transfer as to (a) field of charitable purposes or particular charitable organizations or purposes to be supported, (b) manner of distribution, including amounts, times, and conditions of payments and whether from principal and/or income, and (c) a name as a memorial or otherwise for a fund given, or addition to a fund previously held, or anonymity for the gift.