We develop an approach, using what we call tensor $D$ coaction functors, to the $C$-crossed-product functors of Baum, Guentner, and Willett. We prove that the tensor $D$ functors are exact, and identify the minimal such functor. This continues our program of applying coaction functors as a tool in the Baum-Guentner-Willett-Buss-Echterhoff campaign to attempt to fix the Baum-Connes conjecture.
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