What is the purpose of the Bash built-in export command?

What is the purpose of the Bash built-in export command?
A . It allows disks to be mounted remotely.
B . It runs a command as a process in a subshell.
C . It makes the command history available to subshells.
D . It sets up environment variables for applications.
E . It shares NFS partitions for use by other systems on the network.

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Answer: D