(A) Option. The term option means the right or privilege of an individual to purchase stock from a corporation by virtue of an offer of the corporation continuing for a stated period of time, whether or not irrevocable, to sell such stock at a price determined under paragraph (b)(5)(vi)(D) of this section, such individual being under no obligation to purchase. While no particular form of words is necessary, the option must express an offer to sell at the option price, the maximum number of shares purchasable under the option, and the period of time during which the offer remains open. The term option includes a warrant that meets the requirements of this paragraph (b)(5)(vi)(A). An option may be granted as part of or in conjunction with an employee stock purchase plan or subscription contract. An option must be in writing (in paper or electronic form) provided that such writing is adequate to establish an option right or privilege that is enforceable under applicable law.