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For the cyclic process given below, which of the following relations are correct?
(a) \( \Delta S=S_{2}-S_{1}=\int_{1}^{2} \frac{\delta q_{\mathrm{rev}}}{T} \)
(b) \( \Delta S=S_{1}-S_{2}=\int_{2}^{1} \frac{\delta q_{\text {irr }}}{T} \)
(c) \( \Delta S_{\text {cycle }}=0=\int_{1}^{2} \frac{\delta q_{\mathrm{rev}}}{T}+\int_{2}^{1} \frac{\delta q_{\mathrm{irr}}}{T} \)
(d) \( \Delta S_{\text {cycle }}=0\left(\int_{1}^{2} \frac{\delta q_{\mathrm{rev}}}{T}+\int_{2}^{1} \frac{\delta q_{\mathrm{irr}}}{T}\right) \)
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