Which of the following shows the laser transition in Neon in He-Ne laser?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10a.png"><img alt="The following shows the laser transition in Neon in He-Ne laser - option a" class="alignnone size-full wp-image-251786" height="300" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10a.png" width="257"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10b.png"><img alt="The following shows the laser transition in Neon in He-Ne laser - option b" class="alignnone size-full wp-image-251787" height="314" sizes="(max-width: 322px) 100vw, 322px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10b.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10b.png 322w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10b-300x293.png 300w" width="322"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10c.png"><img alt="The following shows the laser transition in Neon in He-Ne laser - option c" class="alignnone size-full wp-image-251788" height="295" sizes="(max-width: 417px) 100vw, 417px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10c.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10c.png 417w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10c-300x212.png 300w" width="417"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10d.png"><img alt="The following shows the laser transition in Neon in He-Ne laser - option d" class="alignnone size-full wp-image-251789" height="212" sizes="(max-width: 476px) 100vw, 476px" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10d.png" srcset="https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10d.png 476w, https://www.sanfoundry.com/wp-content/uploads/2019/11/engineering-physics-questions-answers-helium-neon-laser-q10d-300x134.png 300w" width="476"/></a>