Sanderson Mart ran an advertisement in the Daily Tribune that stated, "Special offer to our customers - 3/8 inch Electric Hand Drills, Saturday only - $14.99, only 100 in stock, while they last! Be there when we open for the bargain of the year!" Cruz arrived at the store at 8:00 a.m. when the store opened. The salesperson refused to sell him the drill, claiming that he had only two in stock and those were already set aside for another customer- and besides, the advertisement was not a binding offer.

Question 1: What is the principle of law regarding a valid offer?

Question 2: Explain whether Sanderson will be required to sell the electric drill for the advertised price.