Which LookML should be used to calculate the number of month and years between enrollment month and graduation month?

A developer has the dimensions enrollment_month and graduation_month already defined in the view. Both were created as part of dimension_groups of type: time. The developer need to use these two dimensions in the sql_start and sql_end parameters of a dimension group of type: duration. Which LookML should be used to calculate the number of month and years between enrollment month and graduation month?
A.

B.

C.

D.

Correct Answer: A
Explanation/Reference:
Reference: https://docs.looker.com/reference/field-params/dimension_group

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