When comparing two differently grained facts directly against one another, the developer must:
A. either write a union query or two reports that roll both facts up to a common level
B. either roll up the lower grained fact to the higher level or allocate the higher grained fact to thelower level
C. declare determinants at multiple levels in the dimensions of a DMR Framework Managermodel
D. ensure that all conformed dimensions shared by the facts have the same number of levels
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