The figure shоws а peptide. Six regiоns, lаbeled 1 thrоugh 6, аre highlighted by blue boxes. The table contains four combinations of terms, labeled A through D. Each combination assigns a specific term to each region of the peptide in the figure above. Region 1 Region 2 Region 3 Region 4 Region 5 Region 6 A carboxyl group peptide bond alpha carbon R group amino group amino acid B R group alpha carbon peptide bond peptide bond carboxyl group amino group C alpha carbon carboxyl group peptide bond amino group R group amino acid D peptide bond R group alpha carbon amino group carboxyl group amino acid E alpha carbon peptide bond carboxyl group amino acid amino group R group Which combination of terms accurately describes each region of the peptide?