That's what it said? Wow. I also had the flashcards I made myself so I knew the correct definition. Edit: actually that was the wrong link, this are the flashcards I used https://www.chegg.com/flashcards/mta-signals-1c1abdfd-3ec9-4fef-aca6-6abadfec9580/deck
That one has the right AK definition. But yeah, that's just something I used but I also wrote down the definition as my tss told me and studied that too.