The armature resistance speed control is best illustrated by which of the following?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8a.png"><img alt="The armature resistance speed control - option a" class="alignnone size-full wp-image-160866" height="203" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8a.png" width="300"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8b.png"><img alt="The armature resistance speed control - option b" class="alignnone size-full wp-image-160867" height="227" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8b.png" width="300"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8c.png"><img alt="The armature resistance speed control - option c" class="alignnone size-full wp-image-160868" height="204" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8c.png" width="300"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8d.png"><img alt="The armature resistance speed control - option d" class="alignnone size-full wp-image-160869" height="221" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/electrical-machines-questions-answers-speed-control-dc-motors-q8d.png" width="300"/></a>