What is the value of C.O.P. of low-temperature cascade system in terms of intermediate temperature in the following diagram?If TEL and TCL = Evaporator and condenser temperatures for low-temperature cascade systemTEH and TCH = Evaporator and condenser temperatures for high-temperature cascade system

• A. TEL / TCL – TCL
• B. TCL / TCL – TEL
• C. TCL / TI – TCL
• D. TEL / TI – TCL