The correct answer is 'Virtual patches.' Virtual patches are usually implemented on network security devices such as WAFs (Web Application Firewalls) or IPS (Intrusion Prevention Systems) and are designed to protect against exploits by either blocking or filtering malicious traffic associated with the vulnerability. This method allows for immediate response to emerging threats while the software vendors develop and release permanent fixes. 'Service patches' is a made-up term and not related to the correct concept. Although 'Security hotfixes' and 'Scheduled updates' are both associated with addressing software vulnerabilities, they involve actual changes to the software code, unlike virtual patches.