A load that has a resistance of 10 ohms is to be connected to a supply that has a constant voltage of 120 volts. If it is desired that the current to the load be varied from 3 to 5 amperes, what are the resistance and the current rating of the series rheostat that permit this variation? (a) (a) 5 ohms, 5 A (b) (c) 20 ohms, 10 A (b) 10 ohms, 10 A (d) 20 ohms, 10 A