Indicate the right option to search for BOB, Bob, BOb or BoB?

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Question:Indicate the right option to search for BOB, Bob, BOb or BoB?

1.grep –i Bob files

2.grep ‘B[oO][bB]’ files

3.grep ‘[BOB]’ files

4.grep -v ‘Bob’ files

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  1. Indicate the right option to search for BOB, Bob, BOb or BoB?
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