How can an Einstein Consultant use the Dataflow nodes to generate the name of month as a new dimension in the dataset?

A client has a dashboard for Sales Managers. They want to have a list filter that shows the name of the month. However, based on the "CloseDate_Month" field, the list filter shows numbers instead of names.

How can an Einstein Consultant use the Dataflow nodes to generate the name of month as a new dimension in the dataset?
A . flatten
B . compute Relative
C . compute Expression
D . append

Answer: C