Which one out of A – D given below correctly represents the structural formula of a basic amino acid?

A basic amino acid contains more amino groups ($-{\text{NH}}_2$) than carboxyl groups ($-\text{COOH}$) in its structure. Lysine (Structure C) is a classic example, as it contains an additional amino group in its side chain ($R$ -group).Acidic amino acids (like Glutamic acid) have extra $-\text{COOH}$.Neutral amino acids (like Alanine) have one of each.