Question: What will be the value referenced by str 1 after executing the following code? str 1 = x . join ( [

What will be the value referenced by str1 after executing the following code?
str1="x".join(["A","b","5"])
str1.lower()
Group of answer choices
This will cause an error because the lower method cannot be applied to non-alphabetic characters.
"xaxbx5x"
"xAxbx5x"
"Axbx5"
"axbx5"

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