Explanation:

(b)

Shows zwitter ionic form. Zwitter ions are those ions that are electrically neutral overall but contain non adjacent regions of positive and negative charges. They are sometimes referred to as dipolar ions. Free amino acid found in cells is an example of zwitterion. General structure of an amino acid exposes two parts, or groups, of the molecule that can function as an acid/base pair, the $-\text{COOH}$ and $-\text{N}{{\text{H}}_{2}}$ groups.