The correct van der Waals equation for 1 mole of a real gas is

Options

1. A$\left(\mathrm{p}+\frac{\mathrm{an}^2}{\mathrm{~V}^2}\right)\left(\mathrm{V}^2-\mathrm{nb}\right)=R T$
2. B$\left(\mathrm{p}+\frac{\mathrm{an^{2 }}}{\mathrm{V}}\right)(\mathrm{V}-\mathrm{nb})=\mathrm{nRT}$
3. C$\left(p+\frac{a}{V^2}\right)(V-b)=R T$
4. D$\left(p+\frac{V^2}{a}\right)(V-b)=R T$