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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 async def get_dnssec_validation(cls) -> DNSSEC: """Enable DNSSEC validation of upstream zones. Only used when MAAS is running its own DNS server. This value is used as the value of 'dnssec_validation' in the DNS server config. """

        data = await cls.get_config("dnssec_validation")
        return cls.DNSSEC.lookup(data)