Agentless scanning is the correct choice in this situation because it allows for vulnerability assessments of a variety of devices without the need to install software on them. This method is beneficial in enterprise environments where there may be a diverse and large number of endpoints such as mobile units, IoT devices, and traditional servers, enabling scans with minimal disruption to operations. Agent-based scanning would require software to be installed on each endpoint, which could be disruptive and also difficult to manage across such a heterogeneous environment.