ii and iv are true
i is false as a regular grammar can also be ambiguous
for clarification on iv, go through the explanations here https://gateoverflow.in/906/gate2003-16
yes aambazinga your ans. is correct. but statement 3. All LR(0) grammars are LL(k) why this statement is false
and can you explain why statement 4 is correct.
ambiguity and left recursion and left factoring are independent conditions... one doesn't lead to other. hence iv is true.