What are the different methods followed to take p-n-p-n device from its conducting state to the non-conducting state?
1. Reducing the anode current below the holding value.
2. Reducing the gate current to zero.
3. Reducing the gate voltage to zero.
4. Reducing anode voltage below the holding value.
Select the correct answer using the options given below:

A. 1 and 2

B. 2 and 3

C. 1 and 4

D. 3 and 4

Answer: Option C