MSSPs may also be referred to as which of the following?

Managed Security Service Providers (MSSPs) are organizations that provide outsourced monitoring and management of security systems and services. They offer a comprehensive range of security services, typically encompassing firewalls, intrusion detection, virtual private networks (VPNs), and more, to help businesses protect their information systems from various cyber threats.

The term "Security as a Service" (SECaaS) is an appropriate way to reference MSSPs, as it encapsulates the delivery model of security services through the cloud, allowing businesses to access security measures without having to deploy them on-site. This model aligns well with the services provided by MSSPs and highlights the scalable and flexible nature of their offerings.

The other terms suggested do not accurately represent the scope of what MSSPs provide. While "Protection as a Service" could imply some degree of security, it lacks the specificity associated with comprehensive security management and monitoring. "Physical Security as a Service" would primarily refer to physical security measures and is not reflective of the broader cybersecurity services that MSSPs are known for. Thus, "Security as a Service" is the most fitting description for MSSPs.