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The action table of an LR parser is indexed by

  • A.nonterminal and terminal symbol
  • B.production number and lookahead token
  • C.state and terminal symbol
  • D.state and nonterminal symbol

Answer: C

Correct answer: state and terminal symbol

The action table answers “in this state, with this lookahead, what should I do”, so it is indexed by state and terminal, and its entries are shift, reduce, accept or error. The goto table is the one indexed by state and nonterminal, and it is consulted only after a reduction.

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