The diagrams show the structures of two amino acids, each of which has two amine $\left(-{\mathrm{N}\mathrm{H}}_2\right)$ groups.



A peptide bond is formed between the two amino acids. Which groups could form the peptide bond?

Assertion (A): An optically active amino acid can exit in three forms depending on the $\mathrm{pH}$ of the solution.

Reason (R): Amino acids contain both acidic and basic groups, they exist as zwetter ion in aq. medium, anionic form in acidic medium and cationic form in basic medium

Assertion (A) : In aqueous solution, $\alpha$-amino acids exists as internal salt called as zwitter ion.

Reason (R) : Proline is a natural amino acid having a secondary amino group.
The correct option among the following is

The following tripeptide

can be represented as