A penetration tester is troubleshooting the right value for the urls variable that should be used in the following script: Which of the following instructions in a Python script will prevent…

`[u for u in url_list if u not in url_list]` is a logically flawed list comprehension that will always result in an empty list because an item is always in the list it is being iterated over.

Creating a dictionary `{{u: True for u in url_list}}` uses each unique URL as a key, automatically eliminating duplicates since dictionary keys must be unique. Subsequently, calling `.keys()` returns a view object of these unique URLs, and `list()` converts this view into a list of unique entries suitable for further processing.

`f"{{u: True for u in url_list}}"` is an f-string that attempts to format the dictionary as a string, not create a list of unique URLs.

`json.dumps({{u: True for u in url_list}}.keys())` converts the keys (unique URLs) into a JSON formatted string, which is not the desired list output.