Question: Which is the simplest C + + expression that is true only when myChar is among a - z or A - Z ? isalpha

Which is the simplest C++ expression that is true only when myChar is among a-z or A-Z?
isalpha(tolower(myChar))|| isalpha(toupper(myChar))
isalpha(myChar) && !isspace(myChar)
isalpha(tolower(myChar))
isalpha(myChar)

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