A systems administrator needs to write a script that performs unattended package upgrades. Which of the following flags should be used with either yum or apt to meet this goal?

Note - the provided answer is A (-u), but -u in apt-get is the --show-upgraded flag that lists packages to be upgraded and does not suppress prompts. The technically correct answer is -y (choice C): both yum -y and apt-get -y automatically answer 'yes' to all confirmation prompts, enabling fully non-interactive, unattended package upgrade scripts without any manual intervention.

-q (quiet) suppresses informational output but does not answer interactive prompts, so the command still pauses and waits for user confirmation before proceeding.

-y is the correct flag for unattended operation as it configures both yum and apt-get to assume yes on all prompts, making it the technically accurate answer for this goal.

-d in apt-get enables download-only mode, fetching packages without installing or upgrading them, which does not fulfill the unattended upgrade requirement.