During the state of shear failure, which of the following principal stress relationship exist?

• A. ‚âà√¨‚àö√¢ 1= ‚âà√¨‚àö√¢ tan ‚âà√≠¬¨¬± + 2c tan ‚âà√≠¬¨¬±
• B. ‚âà√¨‚àö√¢1 = ‚âà√¨‚àö√¢3 tan2 ‚âà√≠¬¨¬± + 2c tan ‚âà√≠¬¨¬±
• C. ‚âà√¨‚àö√¢1 = 2c tan ‚âà√≠¬¨¬±
• D. ‚âà√¨‚àö√¢1 = ‚âà√¨‚àö√¢3 tan ‚âà√≠¬¨¬±