Generally speaking, what's the best way to connect two data or fact tables within the same model?

A$.$

Deduplicate the foreign keys in one table to create a one$-$to$-$many relationship

B$.$

Deduplicate the foreign keys in both tables

C$.$

Match the row$-$level granularity in order to define a one$-$to$-$one relationship

D$.$

Relate them through shared lookup tables