Or, nor and subject-verb agreement

Which is correct?
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Sometimes Perl or Python ____ used instead of PHP.
a. is |
Answer: a
Explanation:
When two or more singular nouns or pronouns are connected by “or” or “nor”, use a singular verb. Think of it this way: We’re saying sometimes Perl (is used instead of PHP) or Python is used instead of PHP.
Go see the Purdue Owl for more about subject-verb agreement.
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Thanks to Peggy Rouse (@whatisdotcom) for this one.
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