Final answer:
Mobile Device Management (MDM) is the solution designed to push security policies to mobile devices over a network connection, providing control and security for various endpoints.
Step-by-step explanation:
The solution that pushes security policies directly to mobile devices over a network connection is Mobile Device Management (MDM). MDM software allows IT administrators to control, secure, and enforce policies on smartphones, tablets, and other endpoints. It includes the distribution of applications, data, and configuration settings, and patches for devices such as mobile phones, laptops, and tablet computers. Thus, a firewall, virtual private network (VPN), and endpoint protection are important components of an organization's overall security posture, they do not serve the specific function of pushing security policies to mobile devices.