The regular expression that would match a 5 letter palindrome, (e.g. "radar"), would be

  1. ([a-z])([a-z])[a-z]\2\1

  2. ([a-z])([a-z])[a-z]\2\3

  3. \2\1([a-z])([a-z])[a-z]

  4. ([a-z])([a-z])[0-9]\2\1


Correct Option: A

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