Which of the following conditions is correct for reverse osmosis? [$C =$ Concentration of solution in $mol \ L^{-1}$; $T =$ Temperature in Kelvin scale; $P_{ext} =$ External pressure; $\pi = CRT =$ Osmotic pressure]
- A$P_{ext} = CRT$
- B$P_{ext} > CRT$
- C$P_{ext} < CRT$
- D$P_{ext} > nRT$
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