Question: After setting a variable named VAR 1 , a script complains that the variable doesn't exist. How can you ensure that this variable is available

After setting a variable named VAR1, a script complains that the variable doesn't exist. How can you ensure that this variable is available for subshells?
Add the variable to a config file in the /etc directory.
Run the command "export $VAR1".
Use the "env $VAR1" command.
Add the $VAR1 variable as a flag for the script.

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