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The appropriate command to downgrade to Permissive Security from Recovery mode involves using command-line tools available in Terminal. In Recovery mode, access to Terminal facilitates executing specific commands that can alter security configurations. Since the task is focused on changing the system's security mode, command-line tools are the most direct and effective means of achieving this.

Other options, while related to security settings, do not directly address the method for downgrading to Permissive Security. Security settings from RecoveryOS might allow observations or configurations but do not provide the command execution needed for this specific change. Similarly, the Startup Security Utility app is primarily for setting and management rather than executing a command for downgrading security settings. Permissions settings in Recovery mode could adjust various permissions but do not offer the same command-line capabilities required for this task.