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

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