Classify the below use-case description to one of the following NLP tasks: Short form generation, Long form generation, Summarization, Classification, Question answering, Paraphrasing, Conversational agent, Information extraction, Generate code

Use case: I have a lot of legacy documentation which needs to be cleaned, summarized, and queried. I think AI21 would help.
NLP task: Summarization

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Classify the below use-case description to one of the following NLP tasks: Short form generation, Long form generation, Summarization, Classification, Question answering, Paraphrasing, Conversational agent, Information extraction, Generate code

Use case: Answer questions based on a given corpus of information
NLP task: