Which River is joining in the river Indus at Attock ?

Which River is joining in the river Indus at Attock ?A. Kabul River
B. Kunar River
C. Hakra River
D. None of These

The Kābul River joins the Indus just above Attock, where the Indus flows at an elevation of 2,000 feet (600 metres) and is crossed by the first bridge carrying rail and road.