Three voltmeters, all having different internal resistances are joined as shown in figure. When some potential difference is applied across \( A \) and \( B \), their readings are \( V_1, V_2 \) and \( V_3 \). Choose the correct option.
\( V_1 = V_2 \)
\( V_1 + V_2 = V_3 \)
\( V_1 + V_2 > V_3 \)
\( V_1 \neq V_3 - V_2 \)
