Common potential when a charged capacitor is joined in parallel with another

1. A.
   $\dfrac{C_1V_1}{C_2}$
2. B.
   $\dfrac{C_1V_1}{C_1 + C_2}$
3. C.
   $\dfrac{C_2V_1}{C_1}$
4. D.
   $\dfrac{C_2V_1}{C_1 + C_2}$

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1. A.
   $400$ V
2. B.
   $200$ V
3. C.
   $100$ V
4. D.
   $50$ V

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