How is nMOS inverter represented?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6a.png"><img alt="nMOS inverter representation - option a" class="alignnone size-full wp-image-161864" height="264" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6a.png" width="223"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6b.png"><img alt="nMOS inverter representation - option b" class="alignnone size-full wp-image-161865" height="264" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6b.png" width="218"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6c.png"><img alt="nMOS inverter representation - option c" class="alignnone size-full wp-image-161866" height="264" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6c.png" width="225"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6d.png"><img alt="nMOS inverter representation - option d" class="alignnone size-full wp-image-161867" height="272" src="https://www.sanfoundry.com/wp-content/uploads/2017/05/vlsi-questions-answers-nmos-inverter-q6d.png" width="238"/></a>