How does the speed build up takes place in a dc motor with time?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7a.png"><img alt="The speed build up takes place in a dc motor with time - option a" class="alignnone size-full wp-image-160856" height="218" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7a.png" width="300"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7b.png"><img alt="The speed build up takes place in a dc motor with time - option b" class="alignnone size-full wp-image-160857" height="214" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7b.png" width="300"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7c.png"><img alt="The speed build up takes place in a dc motor with time - option c" class="alignnone size-full wp-image-160858" height="205" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7c.png" width="300"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7d.png"><img alt="The speed build up takes place in a dc motor with time - option d" class="alignnone size-full wp-image-160859" height="221" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-dc-motor-starting-q7d.png" width="300"/></a>