pls check my circuit diagram in the ans section. if its wrong pls tell me how to draw the correct circuit diagram.

Dear student,

Option 4 is the right answer.
explanation

hence, answer Ceq=C=ε0Ad

Note:
whene two capacitors are in series, then 
Ceq=C1C2C1+C2when capacitors are in parallel,Ceq=C1+C2
Regards,

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Pls check it

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