Which of the following types of diaphragms has the larges allowable shear value A- blocked plywood diaphragm with a 3/8" panel of structural I-grade B- unblocked plywood diaphragm with a 3/8" panel of structural I-grade C- Diaphragm made of steel deck with a 2" concrete topping. D- Diaphragm that consists of a 6" concrete slab