Which of the following statements about Yellen is INCORRECT？A．She once taught at Harvard U

Which of the following statements about Yellen is INCORRECT？

A．She once taught at Harvard University.

B．She got tenure at Berkeley University.

C．She has a Nobel Prize in Economic Theory.

D．She has been working in the Federal Reserve for over 10 years.

请帮忙给出正确答案和分析，谢谢！