Consider the following statements An iron cored choke is non linear and passive device.A carbon resistor kept in sunlight is a time invariant and passive device.A dry cell is a time varying and active device.An air capacitor is time invariant and passive device. Of these statements

• A. 1, 2, 3 and 4 are correct
• B. 1, 2, 3 are correct
• C. 1, 2, 4 are correct
• D. 2 and 4 are correct