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Probably people who are mute or deaf.

That being said, the ultra dense morons who think "oral" can't be extended in a special case to simply mean "without extra time to think" (which is what is is, mostly) are typically not experienced with these exams.

The parent teaches CS1 and is not likely to have been given a formal oral examination in their likely short career (these are usually reserved for PhD qualifying and special MScs).