Consider the diagrams. They give the NVD. The thick line represents the scheme. Which of these schemes is unbounded?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10a.png"><img alt="The thick line represents the scheme giving the NVD - option a" class="alignnone size-full wp-image-252281" height="217" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10a.png" width="255"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10b.png"><img alt="The thick line represents the scheme giving the NVD - option b" class="alignnone size-full wp-image-252282" height="221" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10b.png" width="257"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10c.png"><img alt="The thick line represents the scheme giving the NVD - option c" class="alignnone size-full wp-image-252283" height="226" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10c.png" width="255"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10d.png"><img alt="The thick line represents the scheme giving the NVD - option d" class="alignnone size-full wp-image-252284" height="223" src="https://www.sanfoundry.com/wp-content/uploads/2019/11/computational-fluid-dynamics-questions-answers-convection-boundedness-criterion-q10d.png" width="252"/></a>