Consider the following statements and select the correct answer from the codes given below. 1. **Rihand Dam** is on a tributary of the Sone river. 2. **Hirakund Dam** is on Mahanadi river. 3. **Tungabhadra Project** is a joint venture of Andhra Pradesh and Karnataka. 4. **Maithan Dam** is on Barakar river, a tributary of Damodar river. **Codes**: