If $l = \text{length}$,$R = \text{Resistance}$,and $A = \text{Area of cross-section}$,then which of the following relations is correct?
- A$R \propto \frac{1}{A l}$
- B$R \propto \frac{A}{l}$
- C$R \propto \frac{l}{A}$
- D$R \propto l A$
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