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Question

Let $\sigma_1$ and $\sigma_3$ are major and minor principal stresses respectively. The equation $\sigma_1 = f(\sigma_3)$ denotes the failure envelop of a rock as shown in the figure. Match the zones (P, Q, R and S) with the legend code. Screenshot 2025-02-01 002129.png

Legend

Code	Name
1.	Safe zone
2.	Tensile zone
3.	Infeasible zone
4.	Unsafe zone

MCQ

A: $P$ -1, $Q$ -2, $R$ -4, $S$ -3

B: $P$ -3, $Q$ -1, $R$ -4, $S$ -2

C: $P$ -3, $Q$ -1, $R$ -2, $S$ -4

D: $P$ -1, $Q$ -4, $R$ -3, $S$ -2

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