Arthur mails an offer to Brian on June 15. Brian receives the offer on June 16. Arthur mails a revocation of the offer on June 17. Brian mails a letter of acceptance on June 18. Brian receives therevocation on June 19. Was a contract formed?a.Yes, on June 16.b.Yes, on June 17.c.Yes, on June 18.d.No, the offer was revoked before acceptance.