The stress versus strain graphs for wires of two materials A and B are as shown in the figure. If \( Y_A \) and \( Y_B \) are the Young's modulii of the materials, then:

1
\( Y_B = 2Y_A \)
2
\( Y_A = Y_B \)
3
\( Y_B = 3Y_A \)
4
\( Y_A = 3Y_B \)

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