What is the total thermal resistance associated with this heat transfer process in double pipe heat exchanger with clean surfaces?]

(Symbols have their usual meaning)

1
\(\sum R_{th}=\frac{ln(d_0/di)}{2 \pi Lk}+\frac{1}{h_0A_0}\)
2
\(\sum R_{th}=\frac{1}{h_iA_i}+\frac{ln(d_0/di)}{2 \pi Lk}\)
3
\(\sum R_{th}=\frac{1}{h_iA_i}+\frac{1}{h_0A_0}\)
4
\(\sum R_{th}=\frac{1}{h_iA_i}+\frac{ln(d_0/di)}{2 \pi Lk}+\frac{1}{h_0A_0}\)
5
Question Not Attempted

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