A Trading Member may only execute Direct Business that is:—
(1) at least:—
(a) 50,000 units of securities or futures contracts, or in the case of Marginable Futures Contracts, 50,000 units of the underlying; or
(b) $150,000 in terms of contract value;
(2) a book-out trade from an error account to remedy an error; or
(3) to complete a customer's order that was partially filled in the market, provided the original order met the minimum size in Rule 8.7.1(1) above.