How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?

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How can the existing environment variable FOOBAR be suppressed for the execution of the script./myscript only?
A. unset-v FOOBAR;./myscript
B. set-a FOOBAR="";./myscript
C. env -u FOOBAR./myscript
D. env-i FOOBAR /myscript

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