Which statement best applies to this diagram?

a$.$ Some classical architectural orders have columns, and some have rectangular piers.

b$.$ The classical architectural orders have different column capitals.

c$.$ The classical architectural orders all derive from the composite order.

d$.$ The classical architectural orders all have ornate column bases.

Which of the following best describes the Ionic order?

a$.$ It emerged in the Greek Archaic period as the first classical order.

b$.$ It is the most widespread of the Roman adaptations of the classical orders.

c$.$ Appearing after the Doric order, its columns are more slender and decorative.

d$.$ It is considered the most organic of the classical orders.