K-maps, do they completely simplify?
The K-Map is producing either the minimal Sum Of Products (SOP), if "circling" the ones, or the minimal Product of Sums (POS), if circling the zeros. Let's do the latter (my grouping is using the red line):



Now, the group of 4 is giving us \$I\$ (as it is the only term which has the same value of \$0\$ in this group) and the group of two is giving us \$A+B\$. So the final result is \$I\cdot(A+B)\$.