Assume Stanley and Mark negotiate for the sale of a used computer. Mark offers Stanley $$500$ for his computer. Stanley says he needs time to think about it$.$ That same night, Stanley sends a letter of acceptance to Mark through the mail. The letter should be delivered by the next day at $5pm.$ The same night Stanley sends a letter of acceptance, Mark sends a letter of revocation through the mail. The letter of revocation is expected to arrive the next day at $4pm.$ Which of the following statements is true under the common law?