What does signature liability, aka contract liability, mean in Article 3 for a drawer of a check and an indorser of a check? a. The indorser will have secondary liability to pay while the drawer will have primary liability O b. Signing makes them liable to pay money for the instrument if those with primary liability fail to pay. O c. The indorser will have primary liability to pay while the drawer will have secondary liability. O d. Signing attaches primary liability to them to pay the instrument when it is presented for payment