The variation of current in the armature can be best expressed by which of the below curves?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13a.png"><img alt="The variation of current in the armature - option a" class="alignnone size-full wp-image-160795" height="300" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13a.png" width="164"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13b.png"><img alt="The variation of current in the armature - option b" class="alignnone size-full wp-image-160796" height="300" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13b.png" width="183"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13c.png"><img alt="The variation of current in the armature - option c" class="alignnone size-full wp-image-160797" height="300" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-machine-torque-q13c.png" width="248"/></a>
• D. An impulse signal