Commercial or political soliciting, vending of all kinds, displaying or distributing commercial advertising, collecting private debts or soliciting alms on protected property is prohibited. This does not apply to:
(a) National or local drives for welfare, health, or other purposes as authorized by the ``Manual on Fund Raising Within the Federal Service,'' issued by the U.S. Office of Personnel Management under Executive Order 12353, 47 FR 12785, 3 CFR, 1982 Comp., p. 139, or by other federal laws or regulations; and
(b) Authorized employee notices posted on Agency bulletin boards.