Which of the following is the correct expression for calculating skew of quadrilateral element?

• A. Skew=90°+minimum angle formed by joining opposite mid sides of quad element
• B. Skew=90°-minimum angle formed by joining opposite mid sides of quad element
• C. Skew=90°*minimum angle formed by joining opposite mid sides of quad element
• D. Skew=90°/minimum angle formed by joining opposite mid sides of quad element