If A4 ="contact" and B4 = "" return "XXX" but if A4 = "contact" and B4 isn't blank return "Video/Audio" in c4
https://docs.google.com/spreadsheets/d/1OH2i45NyRBThFBMQJ_lYbMtpmYAAzOm0FRp5a1DBOm4/edit?usp=sharing
use:
=INDEX(IF((A4:A="contact")*(B4:B=""), "XXX",
IF((A4:A="contact")*(B4:B<>""), "Video/Audio", )))