Which of the following notations are used for evaluating the relationship for combined stresses?

• A. P, E, M, A, I
• B. P, ‚âà√¨‚àö√¢, M, g, I
• C. P, W, M, ‚âà√¨‚àö√ë, L
• D. P, ‚âà√≠‚Äö√†√®, M, Z, L