Which of the following Python code snippets can be used as a shorter version of the code below with the Walrus Operator? text = f.readline() while text: do_something(text) text = f.readline() while text := f.readline(text()): do_something() while text: do_something(text := f()) while text := f.readline(): do_something (text. readline ()) while text: text := f.readline() do_something (text.readline())