If D = {R1, R2} is a decomposition of R, and F is the set of functional dependencies on R, then which of the following ensures that the decomposition D is…

1. A((R1 ∩ R2) → (R1 − R2)) ∈ F⁺
2. B((R1 ∩ R2) → (R1 − R2)) ∉ F⁺
3. C((R1 ∪ R2) → (R1 − R2)) ∈ F⁺
4. D((R1 ∩ R2) → R1) ∈ F⁺