A CentOS Stream 9 server has the Extra Packages for Enterprise Linux (EPEL) repository file already installed, but the repository is kept disabled by default (enabled=0). You need to install the fping package from EPEL for a one-time task and ensure that the repository remains disabled afterward. Which single command meets this requirement?
The --enablerepo switch temporarily turns on the specified repository for just the current DNF transaction. Using:
dnf --enablerepo=epel install fping
DNF enables the epel repository, resolves dependencies, installs fping, and then immediately returns EPEL to its previous disabled state because the setting in the .repo file is unchanged.
The other choices do not satisfy the scenario:
dnf config-manager --set-enabled epel && dnf install fping permanently changes enabled=1 in the repo file, so EPEL stays enabled.
dnf install fping --fromrepo epel uses a non-existent option (--fromrepo).
dnf install fping --repoenable epel is not a valid DNF option.
Therefore, the temporary --enablerepo form is the only correct answer.
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