Comprehensive and Detailed In-Depth Explanation:
Password selection is the most dependent on the user, as it involves choosing and setting a secure password that meets organizational security requirements.
Option B (Password aging) - Controlled by system settings, not directly by the user.
Option C (Password lockout) - Automatically triggered after failed login attempts.
Option D (Password rotation) - Enforced by system policies, not the individual user's decision.
Since password security starts with user selection, Option A is correct.
Reference: IIA IT Security - Access Control Best Practices

Reference: IIA Business Knowledge for Internal Auditing, Business Continuity Planning section.