Final answer:
The command B. 'apt-get update' is used on Linux to update the package index with the latest software information on Debian-based systems. It refreshes the data regarding available packages without upgrading the installed software.
Step-by-step explanation:
To update software on a Linux host, the correct command to use would be B) apt-get update. This command is typically used in Debian-based distributions, such as Ubuntu, to refresh the local package index with the latest information about available packages and their versions. It's important to note that apt-get update does not actually upgrade the installed software; it only updates the information about new and updated software that is available. If you want to upgrade the installed packages, you would follow apt-get update with apt-get upgrade.
The command that can be used to update software on a Linux host is apt-get update.
This command is used in the Debian package management system, which is commonly used in Linux distributions such as Ubuntu. It allows you to update the package lists and download/install updates for the software packages installed on the system.
For example, if you run 'apt-get update' on a Linux host, it will contact the package repositories specified in the sources.list file and retrieve the latest package information. It will then update the package lists on the host, including any available updates. After running this command, you can use 'apt-get upgrade' to actually install the updates.