The heat developed in a 5 Ω resistor in 2 minutes when a 2 A current passes through it is ________.

Which of the following statements is/are true regarding an incandescent filament bulb? (a) The filament can be made of tungsten. (b) The glass envelope covering the filament is filled with inactive gases such as nitrogen or argon. (c) Since the filament used is thin, its resistance is very high. (d) The resistance of the filament is low to allow more current. (e) The filament material used should have a high melting point.