Which service is known for providing expertise in threat detection and response?

The choice of Managed Detection and Response (MDR) as the correct answer is appropriate because MDR services are specifically designed to provide expertise in threat detection and response. These services combine advanced technology with human expertise to continuously monitor and manage security incidents. MDR solutions analyze security alerts, investigate potential threats, and respond to incidents swiftly, often using threat intelligence and behavioral analytics to enhance their capabilities.

Unlike the other options, which serve different functions, MDR focuses specifically on the proactive identification and remediation of threats in real-time. Managed Security Service Providers (MSSP) typically offer a broader suite of security services, but may not include the deep, hands-on engagement of threat detection and incident response that MDR provides. Security Information and Event Management (SIEM) systems primarily aggregate and analyze data from various sources for security insights, but they do not inherently include responsive actions taken by experts. VPN (Virtual Private Network) services focus on creating secure connections for data transmission and do not involve threat detection or response capabilities.

Therefore, the distinctive emphasis of MDR on both detection and responsive actions makes it the most suitable choice for expertise in threat detection and response.