Which of the following is Zwitter ion of sulphanilic acid?

Sulphanilic acid is $p$-aminobenzenesulphonic acid, which contains both an acidic group ($-SO_3H$) and a basic group ($-NH_2$).

In aqueous solution or in the solid state, the acidic $-SO_3H$ group donates a proton (H^+$) to the basic$-NH_2$group. This internal acid-base reaction leads to the formation of a dipolar ion, known as a zwitterion.<br><br>The resulting zwitterion has a positively charged ammonium group ($-NH_3^+$) and a negatively charged sulphonate group ($-SO_3^-$) at the para positions of the benzene ring.<br><br>Looking at the given options, the structure with$-NH_3^+$and$-SO_3^-$at para positions represents the zwitterion of sulphanilic acid.<br><br>Answer:$