What does the final -hu represent in اِسْتَطْعَمْتُهُ?

Ten Semantic Functions of Form X (Istifʿāl): Seeking, Suitability, Finding, Judging, Transformation, Adoption, Abbreviation, Response, Equivalence and Independent Use

• The pattern of food
• The first-person subject
• The verbal noun
• The person asked for food