Which node should the consultant use in a Dataflow to calculate and insert SalesTax to the dataset?

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An Einstein Analytics consultant is asked to add a new SalesTax field to a Product Sales dataset. The formula to calculate SalesTax is (SubTotal’CountyTax).

Which node should the consultant use in a Dataflow to calculate and insert SalesTax to the dataset?
A . append
B . computeExpression
C . augment
D . computeRelative

Answer: B