Android Fundamentals: Android Security Features

Hey guys I'm stuck on the question "Which Signature Scheme versions are vulnerable to CVE-2017-13156? (Format: 3 words)" anyone have any idea how they want the answer to be formatted. I've tried quite a few different ways but still wrong (As I researched that question I think the answer was >!"V1 signing scheme"!< if you know right answer please tell me thanks

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