JEE Main 2003 Physics Question- A thin spherical conducting shell of radius R has a charge q .

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A thin spherical conducting shell of radius R has a charge q . Another charge Q is placed at the centre of the shell. The electrostatic potential at a point P at a distance R/2 from the centre of the shell is

Option 1) \frac{2Q}{4\pi \varepsilon _{0}R}
Option 2) \frac{2Q}{4\pi \varepsilon _{0}R}-\frac{2q}{4\pi \varepsilon _{0}R}
Option 3) \frac{2Q}{4\pi \varepsilon _{0}R}+\frac{q}{4\pi \varepsilon _{0}R}
Option 4) \frac{\left ( q+Q \right )}{4\pi \varepsilon _{0}}\frac{2}{R}