Identify the correct statement among the following: [JEE Main 2025, 2 Apr (Shift 1)]

All naturally occurring amino acids except glycine contain one chiral centre.

All naturally occurring amino acids are optically active.

Glutamic acid is the only amino acid that contains \(-\mathrm{COOH}\) group at the side chain.

Amino acid, cysteine easily undergo dimerization due to the presence of free SH group.