The security of a system can be improved by1.0 MarksEditing policyBoth (a) and (b)None of theseThreat monitoring

The security of a system can indeed be improved by both editing policy and threat monitoring.

1. Editing Policy: This involves updating and modifying the security policies in place to protect a system. This could include changing password requirements, updating user access controls, or implementing new protocols for data protection. Regularly updating and enforcing these policies can help to eliminate vulnerabilities and improve overall system security.

2. Threat Monitoring: This involves continuously monitoring a system for any potential threats or breaches. This could include tracking unauthorized access attempts, monitoring for malware or other harmful software, or analyzing system logs for suspicious activity. By actively monitoring for threats, you can identify and respond to security issues more quickly, preventing potential damage.

So, the answer is "Both (a) and (b)".