Objective: How can I carry a large sheet of plywood or drywall by myself?

Which of the following solutions is more sound in terms of naive physics reasoning?

Choose from: +Tie together two ends of a length of rope about 18 ft. long. Hook this loop around the two bottom corners of the sheet to form a handle.. +Tie together two ends of a length of rope about 18 ft. long. Hook this loop around the two top corners of the sheet to form a handle..
Tie together two ends of a length of rope about 18 ft. long. Hook this loop around the two bottom corners of the sheet to form a handle.