How should the business analyst meet these requirements?

A data architect adds a field to an existing data model that contains new values for the ProductGroup.

The business analyst needs to efficiently update the app and meet these requirements:

– Use the existing charts, which are built using a master item dimension called ProductGroup

– Existing charts must use the new values for ProductGroup

– Business users must be able to compare the new and old values

How should the business analyst meet these requirements?
A . Change the ProductGroup dimension using the new field, and create a new dimension in the master items for the old field.
B . Create a calculated dimension on the charts to allow the users to compare the new value to the old value.
C . Replace the dimensions on all charts to use the new ProductGroup field added to the data model.
D . Use set analysis on the chart measures to see the difference in ProductGroup between the new field and the old field.