The major difference between open- and closed-die forging without flash is: a. closed-die forging is only suitable for powder metals b. open-die forging is better appropriate for large, intricate parts and long production runs c. as a subsequent process, open-die forging is better suited for sand casting than die casting d. in closed-die forging the shape and size of the workpiece are determined by those of the dies e. none of the above