Which is the active imperfect of اِسْتَعَارَ?

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

• يَسْتَعِيرُ
• يُسْتَعَارُ
• يَسْتَعِينُ
• يَخْتَارُ