Which of the following statements is false?

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Which of the following statements is false?

1. An unambiguous grammar has same leftmost and ans rightmost derivation
2. An LL (1) parser is a top – down parser
3. LALR is more powerful than SLR
4. An ambiguous grammar can never be LR (k) for any k

Correct Option: A

So (a) & (c) are, true.
An ambiguous grammar can't be LR (K)
So option (a) is false since an unambiguous grammar has unique right most derivation & left most derivations but both are not same. Hence (a) is correct option