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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_windows_kms_host(cls) -> typing.Optional[str]: """Windows KMS activation host. FQDN or IP address of the host that provides the KMS Windows activation service. (Only needed for Windows deployments using KMS activation.) """

        data = await cls.get_config("windows_kms_host")
        return None if data is None or data == "" else data