Which of the following security threats is the cause of the greatest amount of data loss?

Question

BlackTom AI · Accepted Answer

Human (user) error — accidental deletion, misconfiguration, or improper handling of data — is the most common single cause of data loss.

1. Relevant knowledge points and concepts
- Types of data loss causes include: malicious attacks (malware, hackers, unauthorized access) and non-malicious causes (user error, hardware failure, software bugs).  
- User error covers actions like accidentally deleting files, misconfiguring systems or permissions, emailing sensitive files to the wrong recipient, losing removable media or devices, and failing to follow backup procedures.  
- Effective controls include backups, training, least-privilege access, and change-management; absence of these increases vulnerability to user mistakes.

2. Step-by-step reasoning
- Compare the nature and frequency of causes: malicious attacks can be severe but are often targeted and (in many organizations) mitigated by security controls.  
- User errors occur frequently across all levels of an organization (every employee can accidentally delete or misconfigure). Because they are numerous and often go unreported or unprotected by controls, the aggregate volume of data lost from mistakes is larger than any single category of malicious attack.

3. Intermediate illustration (no numeric calculation required)
- Example sequence: an employee accidentally deletes a shared folder and the backup retention was misconfigured → data permanently lost. Multiply that by many such mistakes across an organisation and you get a large cumulative loss.

4. Why the correct answer is correct
- The question asks which threat causes the greatest amount of data loss. Empirical industry experience and incident analyses consistently show human error accounts for the largest share of data-loss incidents, because mistakes are common, can affect large datasets, and are not always prevented by security tools.

5. Why the other options are incorrect
- a. Unauthorised access: serious but less frequent than aggregate user mistakes.  
- b. Malware: can cause large loss, but outbreak events are episodic and often detected/mitigated.  
- c. Hackers: targeted and severe but not as frequent in total data-loss volume as routine user errors.

6. Conclusion
- Therefore the correct choice is d. User error, which matches the provided answer.

Which of the following security threats is the cause of the greatest amount of data loss?单项选择题

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