Final answer:
The Group Policy Editor enables a system administrator or security practitioner to set and enforce key security policies at different levels in the Active Directory.
Step-by-step explanation:
The correct answer is a) Group Policy Editor.
The Group Policy Editor is a tool that allows system administrators or security practitioners to set and enforce key security policies at the Active Directory Forest, Domain, and Organizational Unit level.
With the Group Policy Editor, administrators can configure security settings such as password policies, account lockout settings, user rights assignments, and more across their network.