Which of the following equations will be satisfied by irrotational flow of an incompressible fluid?

• A. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/14-123-1.png">
• B. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/14-123-2.png">
• C. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/14-123-3.png">
• D. <img src="/_files/images/civil-engineering/upsc-civil-service-exam-questions/14-123-4.png">