Internal support telling me to put in different DNS A record than netlify docs

Hello,

Project at umrob.netlify.app, adding custom domain robotics.umich.edu. I can’t use CNAME because robotics.umich is a zone, and found the A record for Netlify as 75.2.60.5.

However, our IT seems to believe the following should be used, from host command:
A 100.28.201.155
A 34.234.106.80
AAAA 2600:1f18:16e:df02::65
AAAA 2600:1f18:16e:df01::65

I would assume those might change within Netlify, correct? And I should only use the single A record 75.2.60.5?

Then www.robotics.umich could still use CNAME of umrob.netlify.app?

Thank you!

FYI: Yes, using 75.2.60.5 worked!