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From which cycle does maximum possible efficiency of a heat engine operating between two temperature limits cannot exceed?

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From which cycle does maximum possible efficiency of a heat engine operating between two temperature limits cannot exceed?

(a) Carnot cycle

(b) Otto cycle

(c) Open cycle

(d) Anderson cycle

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This intriguing question originated from Ocean Thermal Energy Conversion topic in chapter Ocean Energy & Geothermal Energy of Energy Engineering

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Correct choice is (a) Carnot cycle

The best explanation: The maximum possible efficiency of a heat engine operating between two temperature limits cannot exceed that of a Carnot cycle operating between the same temperature limits. The Carnot efficiency is given by

    ηc = (T1-T2)/T1.

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