Which one of the following is the correct velocity profile of a packed bed setup?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6a.png"><img alt="The correct velocity profile of a packed bed setup - option a" class="alignnone size-full wp-image-247416" height="189" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6a.png" width="141"/></a>
• B. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6b.png"><img alt="The correct velocity profile of a packed bed setup - option b" class="alignnone size-full wp-image-247417" height="184" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6b.png" width="134"/></a>
• C. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6c.png"><img alt="The correct velocity profile of a packed bed setup - option c" class="alignnone size-full wp-image-247418" height="192" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6c.png" width="125"/></a>
• D. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6d.png"><img alt="The correct velocity profile of a packed bed setup - option d" class="alignnone size-full wp-image-247419" height="166" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-bed-temperature-profiles-q6d.png" width="116"/></a>