Debt to equity ratio is different in Schweser book 2 and in Volume 1

Hi Guys

I am totally confused here.

Debt to equity ratio given in Book 2 page 72 is total debt to equity ratio (incl pension liab), while ratio given in volume - 1 page 520 is operating liabilities to equity ratio. Which one to use in the exam if asked about only debt to equity ratio?

I hope i am not missing anything.