Hot oil is cooled from 80 to $$50^\circ C$$ in an oil cooler which usesair as the coolant. The air temperature rises from 30 to $$40^\circ C$$. The designer uses a LMTD value of $$26^\circ C$$. The type of heat exchanger is

A

Parallel flow

B

double pipe

C

counter flow

D

cross flow