A. A wall mounted or freestanding sign, not exceeding fifteen square feet in area, erected upon the premises of a church or other institution for the purposes of displaying the name of the institution and its activities or services. Freestanding signs shall not exceed six feet in height;

B. A land sales sign of twenty-five square feet or less, non-illuminated, advertising the sale or development of a subdivision containing an area of not less than seven lots, erected upon the property so developed and advertised for sale.