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    Question

    AB`->` CD AF`->` D DE`->` F C`->`

    G F`->` E G`->` A Then which of the following is false?
    A (CF) CLOSURE WILL BE {C,F,G,E,A,D} Correct Answer Incorrect Answer
    B (BG) CLOSURE WILL BE {B,C,A,D,G} Correct Answer Incorrect Answer
    C (AF) CLOSURE WILL BE {A,F,E,D} Correct Answer Incorrect Answer
    D (AB) CLOSURE WILL BE {A,F,E,D} Correct Answer Incorrect Answer
    E Both 3 and 4 are incorrect Correct Answer Incorrect Answer

    Solution

    AB+ = {A, B, C, D, G} → ❌ Missing F, E → So, AB is not a candidate key C → G → A ⇒ ✅ C determines A F → E ⇒ ✅ Given DE → F ⇒ ✅ Given G → B ⇒ ❌ False (no path from G to B) Final Answer: The false statement is: "G → B" or "AB is a candidate key" — both are false.

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