If `A → B` holds in a relation, augmentation lets you also conclude

Question

Accepted Answer

B. AC → BC for any attribute set C

**Augmentation rule:** `A
→ B` implies `AC → BC` for any C. Same attribute added to BOTH sides.
The other options either invert the arrow (impossible without more info), add C to only one side, or restrict to only the LHS — none match Armstrong's actual rule.

Answer

B → A

Answer

A → BC for any C

Answer

AC → B for any C, but never AC → BC

If `A → B` holds in a relation, augmentation lets you also conclude

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