What is the verbal noun of اِجْتَابَ?

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

• اِجْتِيَابٌ
• اِخْتِيَارٌ
• اِسْتِجَابَةٌ
• إِجَابَةٌ