how many mics on iphone 14 pro?

I've been trying to find out exact details regarding the microphones inbuilt into the iPhone 14 Pro. I'm convinced I saw an official Apple developer video describing exactly the number of microphones and how they work to cancel background noise. But I cannot find it.

As far as I can tell, there are 4 mics. I have found documentation detailing the 3 mics (2 at the bottom, and 1 above the front camera) but nothing about the 4th mic (if it exists) located in the camera block on the back of the phone.

I teach videography using iPhones to companies, so I need more detailed information than I can find by searching and browsing the Apple website. Any help greatly appreciated.