Which is the right sequence of a typical Informatica Type 1 Customization?

Which is the right sequence of a typical Informatica Type 1 Customization?
i) Extend Staging and target Database table to accommodate new column.
ii) Copy appropriate Informatica mapping and workflow to Informatica Custom folder.
iii) Modify the existing Informatica mapping workflow to accommodate new columns.
iv) Modify DAC with the necessary change.

A.
i, ii, in, iv

B.
i, iii, ii, iv

C.
iii, ii, i, iv

D.
ii, i, iii, iv