Explanation:

- The treaty you are referring to is the Indus Waters Treaty.

- Option 3: Indus - Correct answer. It was signed in 1960 between India and Pakistan with the mediation of the World Bank. It governs water sharing of the Indus River and its tributaries.

- Option 1: Chenab - The Chenab is part of the Indus River system but is not a standalone treaty.

- Option 2: Beas - The Beas River is part of the Indus River system. However, it’s governed under the larger Indus Waters Treaty.

- Option 4: Jhelum - Similar to the Chenab, Jhelum is also part of the Indus River system.