Technician A says you should use bolts and rubber bands above a cylinder to catch a piston. Technician B says you should place protective covers on the rod bolts to protect the rod journal. Who is correct?

Both Technicians (A and B) are correct. The two statements are steps in preparing to remove the piston assemblies. Technician B statement is the first step in this procedure, putting protective covers will prevent scratch to rod journals. Technician A statement is the second step, this will prevent the piston from falling out the engine block and onto the ground when you push it out of the cylinders.