Thevenin equivalent circuit of a network N is shown above (at terminals 1-1').
To determine the value of R
1. all initial conditions are set to zero
2. all independent sources are turned off
3. all controlled sources are turned off
4. small load connected to terminals 1-1' (outside network N) is removed
Which are correct statements:

A. 1 and 2 only

B. 1, 2 and 4

C. 3 and 4 only

D. 3 only

Answer: Option B