Which command is utilized to view all databases in a MongoDB instance?

The command used to view all databases in a MongoDB instance is "show dbs." This command is directly recognized by the MongoDB shell, allowing users to quickly see a list of all databases present in the currently connected MongoDB instance. When executed, it provides a summary of each database, including its name and size, which is essential for database management and understanding the overall structure of the MongoDB environment.

In contrast, the other options do not correspond to valid MongoDB shell commands. "get databases" and "list db" are not defined commands in MongoDB and would not yield any results, while "view databases" does not exist in the context of MongoDB commands. Understanding the correct command is crucial for efficiently managing and navigating the database environment within MongoDB.