Which of the following represents the $Van \ der \ Waals$ equation for $n$ moles of a real gas?
- A$nRT = \left( P + \frac{a}{V^2} \right) (V - b)$
- B$nRT = \left( P - \frac{a}{V^2} \right) (V - b)$
- C$nRT = \left( P + \frac{a}{V^2} \right) (V + b)$
- D$nRT = \left( P + \frac{n^2a}{V^2} \right) (V - nb)$
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