Which of the following commands lists running processes in Linux?

The `top` command provides an interactive, real-time display of active processes, showing details such as CPU utilization, memory usage, and process IDs. It is an essential tool for system administrators to monitor system performance and identify resource-intensive applications or processes.

`apt-get` is a package management utility used for installing, updating, and removing software on Debian-based Linux distributions.

`ls` is a command used to list the contents of directories.

`cat` is used to concatenate files and print their content to the standard output.