What is the meaning of burnout region/ critical heat flux in boiling, point the region?

• A. <a href="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-general-overview-boiling-q5.png"><img alt="The name of the point circled in following boiling curve of water is critical heat flux - option a" class="alignnone size-full wp-image-248539" height="190" src="https://www.sanfoundry.com/wp-content/uploads/2019/10/heat-transfer-operations-questions-answers-general-overview-boiling-q5.png" width="274"/></a>
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