Question: Which of the following problems is undecidable? A . Determining if a context - free grammar is ambiguous B . Checking if a string belongs

Which of the following problems is undecidable?
A. Determining if a context-free grammar is ambiguous
B. Checking if a string belongs to a regular language
C. Determining if a context-free grammar generates an empty language
D. Finding the shortest path in a graph

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