You want to calculate the difference between the minimum and maximum values of some of your data fields.

Which feature or mode of the Aggregate node would allow you to calculate this using a single node?

A.Aggregate expressions

B.Median mode

C.Default mode
D.Key field grouping

Reference:
ftp://public.dhe.ibm.com/software/analytics/spss/documentation/modeler/15.0/en/UsersGuide.pdf