Question: Which is the simplest expression that is true only when myChar is among a - z or A - Z ? Question 3 options: Character.isLetter

Which is the simplest expression that is true only when myChar is among a-z or A-Z?
Question 3 options:
Character.isLetter(myChar)
Character.isLetter(toLowerCase(myChar))
Character.isLetter(myChar) && !Character.isWhitespace(myChar)
Character.isLetter(toLowerCase(myChar))|| Character.isLetter(toUpperCase(myChar))

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