Which of the following statements on the Amaravati Stupa and its relief sculpture is/are correct ? 1. It was located in the lower Krishna valley. 2. In India, it was next only to the Sanchi Stupa in size. 3. The Amaravati school of sculpture made a lasting impact on the later South Indian sculpture, and its products were carried to Sri Lanka and South-east Asia. Select the answer using the code given below :