In Coulomb‚Äö√Ñ√∂‚à ö√ë‚à ö¬•s wedge theory, the angle ‚âà √≠¬¨‚Ñ¢ is referred as__________?#

• A. Angle of wall friction
• B. Surcharge angle
• C. Critical slip angle
• D. None of the mentioned