Let be a function whose component functions all have continuous partial derivatives. Which of the statements below is correct?

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Let<br><img src='https://www.fatskills.com/images2/GradExams/85C41FCD-94A4-4FEC-91C8-88ED097EBB2C.png' height='15' width='108'/> be a function whose component functions<br><img src='https://www.fatskills.com/images2/GradExams/C319906D-D440-4D58-B1FC-C744A62485B8.png' height='18' width='168'/> all have continuous partial derivatives. Which of the statements below is correct?