A systems administrator deployed a monitoring solution that does not require installation on the endpoints that the solution is monitoring. Which of the following is described in this scenario?

An agentless solution is correct because it describes a monitoring system that gathers data from endpoints without requiring software (agents) to be installed directly on those endpoints. This is often achieved by leveraging existing network protocols, APIs, or remote management interfaces. Client-based solution is incorrect as it implies software installed on the client, which is the opposite of agentless. Open port is incorrect because while an agentless solution might use open ports to communicate, "open port" itself doesn't describe the solution type. File-based solution is incorrect as it refers to monitoring logs or data stored in files, which isn't the primary characteristic described.