4. Arduino GPIO Usage and Applications

Question.8

What will happen if the flyback diode is not used in the relay circuit below? Select the correct statements from below

relay coil will generate a high-voltage spike due to the sudden interruption of current after Turn OFF.
The BC547 transistor will get damage or destroy because of high voltage spike after transistor turn’s OFF.
Very high voltage will cause electric spark near relay joints.
All of the above.