Question: What is the ending value of userString? ( Note the question asks about userString, not about x ) . userString = FaceBook; x = tolower

What is the ending value of userString? (Note the question asks about userString, not about x).
userString = "FaceBook";
x = tolower(userString.at(4));
Group of answer choices
"FaceBook"
"b"
"Facebook"
"Faceook"

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