In the figure below, the temperature profiles of cold and hot fluids in counter double pipe heat exchangers (in different modes of operation) are shown on the left. For each case, match the heat exchange process for the fluid represented by the bold curve with the options given on the right.
- $I-P,\:II-Q,\:III-R,\:IV-S$
- $I-P,\:II-Q,\:III-S,\:IV-R$
- $I-Q,\:II-P,\:III-S,\:IV-R$
- $I-Q,\:II-S,\:III-P,\:IV-R$