When a body is subjected to bi-axial stress i.e. direct stresses ( x) and ( y) in two mutually perpendicular planes accompanied by a simple shear stress ( xy), then minimum normal stress is

• A. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-1.png">
• B. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-2.png">
• C. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-3.png">
• D. <img src="/_files/images/mechanical-engineering/strength-of-materials/91-92-4.png">