Multi-choice problem: Choose from the options at the end, and answer how do you do this: How can I make a bag dispenser holder?

OPTIONS:
(a). open top of ziplock bags box, and tack the flap into the inside of a cabinet door to hold it in place and store it.;
(b). open top of ziplock bag, and tack the bag into the inside of a cabinet door to hold it in place and store it.;
(a).