Which two examples belong to Form IV?

Derived Hollow Wāw and Yāʾ Verbs: Short Paradigms and Morphological Reasoning

• اِسْتَعَانَ and اِسْتَعَارَ
• أَقَامَ and أَطَارَ
• اِجْتَابَ and اِخْتَارَ
• اِنْقَادَ and اِنْقَاضَ