In order to determine whether the Linux host has been added to a path other than the system default or normal business program registration, which environment variable of the Linux system can be checked?

In order to determine whether the Linux host has been added to a path other than the system default or normal business program registration, which environment variable of the Linux system can be checked?
A . $HOSTNAME
B . $SHELL
C . $HOME
D . $PATH

Answer: D

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