The efficiency of an ideal gas with adiabatic exponent \( \gamma \) for the shown cyclic process...

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The efficiency of an ideal gas with adiabatic exponent \( \gamma \) for the shown cyclic process would be
(a) \( \frac{(2 \ln 2-1)}{\gamma /(\gamma-1)} \)
(b) \( \frac{(1-1 \ln 2)}{\gamma /(\gamma-1)} \)
(c) \( \frac{(2 \ln 2+1)}{\gamma /(\gamma-1)} \)
(d) \( \frac{(2 \ln 2-1)}{\gamma /(\gamma+1)} \)
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