The efficiency of the Carnot cycle is (where T1 and T2 = Highest and lowest temperature during the cycle)

• A. <img src="/_files/images/mechanical-engineering/thermodynamics/248-180-1.png">
• B. <img src="/_files/images/mechanical-engineering/thermodynamics/248-180-2.png">
• C. <img src="/_files/images/mechanical-engineering/thermodynamics/248-180-3.png">
• D. <img src="/_files/images/mechanical-engineering/thermodynamics/248-180-4.png">