David can ensure that the Default Domain Policy is applied only to specific managers' accounts by removing the Authenticated Users group from the Security Filtering section and adding the managers' accounts.
Although there are certain exceptions, default account settings are typically managed by the Default Domain Policy GPO. New GPOs can be generated for other policy management tasks; however, there are no constraints on configuring some policy settings at the domain level, where they work best.
Therefore, David can ensure that the Default Domain Policy is applied only to specific managers' accounts.
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