What command retrieves detailed information about each BGP neighbor?

The command that retrieves detailed information about each BGP neighbor is indeed the one indicated. This command provides comprehensive details, including the state of the BGP session, the address of the neighbor, the remote AS (Autonomous System) number, and other relevant metrics that are essential for diagnosing and monitoring BGP configurations and performance.

When using this command, network administrators can evaluate the status of their BGP peerings, such as whether the sessions are established and the routes accepted from each neighbor. This helps in troubleshooting and managing the BGP configurations effectively.

The other options do not serve the purpose of retrieving BGP neighbor information. For instance, one option pertains to the configuration of FortiGuard, which is unrelated to BGP information, while another is focused on a specific routing diagnostic command, which wouldn't yield the detailed neighbor information needed. Thus, the selected command stands out as the correct choice for obtaining the necessary BGP neighbor insights.