Consider the following statements :
1. Network theorems are not derivable from Kirchhoff's law.
2. To get the . Norton current, one has to short the current source.
3. Thevenin's theorem is suitable for a circuit involving voltage sources and series connections.
Which of the above statements is/are correct ?
(a) 1, 2 and 3 (b) 1 only (c) 2 only (d) 3 only