Using which of the following control mode commands is the correct way to substitute all occurrences of /dev/ sdc with /dev/sdd while editing a file in vi?

A systems administrator wants to download a package from a remote server. Which of the following are the BEST commands to use for this task? (Choose two.)

A Linux administrator opens a ticket to have an external hard drive mounted. As a security policy, external storage kernel modules are disabled.
Which of the following is the BEST command for adding the proper kernel module to enable external storage modules?

Which of the following is true about Type 2 hypervisors?

An administrator completed the configuration of the in-addr.arpa zone files for an organization.
Which of the following commands should the administrator use to verify the configuration is working as expected?