Which of the following statements is correct about third-party add-on software?
1) Third-party add-on software can defeat all of a device's security measures if it contains malware.
2) Third-party add-on software is always safe and does not pose any security risks.
3) Third-party add-on software has no impact on a device's security measures.
4) Third-party add-on software can only enhance a device's security measures.