Suppose there are two attributes, length and width, defined in a class called Rectangle. How to call the following function get$\_$length$()$ on a Rectangle object rec?

def get$\_$length$($self$)$:

return self.length

Group of answer choices

rec.get$\_$length$()$

rec.get$\_$length

rec.get$\_$length$($self$)$

get$\_$length$($rec$)$