Find the signal waveform for Quadrature oscillators?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9a.png"><img alt="Quadrature signal graph with phase shift of 90 degree" class="alignnone size-full wp-image-174131" height="228" src="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9a.png" width="350"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9b.png"><img alt="Phase difference and phase shift of an AC" class="alignnone size-full wp-image-174132" height="293" src="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9b.png" width="350"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9c.png"><img alt="Phase shift waveform with 180 degree between sine waveform and cosine waveform" class="alignnone size-full wp-image-174133" height="225" src="https://www.sanfoundry.com/wp-content/uploads/2017/08/linear-integrated-circuits-interview-questions-answers-q9c.png" width="350"/></a>
• D. All of the mentioned