You're working as a network security officer in a large organization. The current network infrastructure includes several servers, hundreds of office computers, an array of smartphones used by field employees, and a variety of IoT devices $($like smart TVs$,$ printers, and cameras$).$ Your task is to improve network security. Which of the following is the best strategy for network segmentation?

Separate the network into two segments: one for servers and office computers, and another for smartphones and IoT devices.

Group all devices based on their physical location in the organization.

Segment the network into four groups: servers, office computers, smartphones, and IoT devices.

Keep the network as a single segment for easier management.