Which of the following pairs is/are correctly matched?

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Waveform	Circuit and Input Signal
1. Triangular wave	Integrating circuit and square wave
2. Impulsive wave	Differentiating circuit and step signal.
3. Sawtooth wave	Differentiating circuit and triangular wave.

Select the correct answer using the codes given below:

1. 2 and 3
2. 1 and 2
3. 1 alone
4. 1 and 3

Correct Option: B

(i) Square wave passes through a integrating circuit → Triangular wave.
(ii) Step input passes through a differentiating circuit → Impulse wave.
(iii) Triangular wave passes through a differentiating circuit → Square wave
Since (i) and (ii) is only correct.
Hence alternative (B) is the correct choice.