C. Restricting removable media may have helped prevent infection from malware that is known to spread via thumb drive or removable media. Answer A is incorrect because encryption of media would not have helped. Answer B is incorrect as edge devices were not specifically targeted. Answer D is incorrect as enforcing application whitelisting would not have prevented advanced persistent threats from executing on local systems. Solution C. Restricting removable media may have helped prevent infection from malware that is known to spread via thumb drive or removable media. Answer A is incorrect because encryption of media would not have helped. Answer B is incorrect as edge devices were not specifically targeted. Answer D is incorrect as enforcing application whitelisting would not have prevented advanced persistent threats from executing on local systems..