The final issue is correctness. Saying “five” as the result of seeing or hearing “two plus two equals” is still intraverbal because all three of the defining features are present. The “correctness” of the response is irrelevant.
A form of verbal behavior with the following features:
A verbal response
The prior controlling variable is a verbal stimulus
There is NO point-to-point correspondence between the stimulus and the response
Then people using ASL to communicate isn’t intraverbal?