How can a dataflow be used to calculate the average time an opportunity spends in each stage?

A company wants to use Einstein Analytics to analyze the trend of their sales pipeline. The

company wants to accelerate the sales process. To do so, they need to know the average time an opportunity spends in each stage. This value is not pre-calculated in Salesforce, so a consultant recommends using a dataflow to calculate it.

How can a dataflow be used to calculate the average time an opportunity spends in each stage?
A . computeExpression Transformation with SAQL Expression to calculate the duration
B . flatten Transformation with Offset Expressions to calculate the duration
C . computeRelative Transformation with offset parameter to calculate the duration
D . computeRelative Transformation with SAQL Expression to calculate the duration

Answer: D

Explanation:

https://help.salesforce.com/articleView?id=bi_integrate_computeRelative_transformation_o peration.htm