Consider the following statements with respect to the Mauryan period:

1. Stupas is the representation of a funeral in which the remains and the ashes of the dead were kept

2. The core of the stupa was made of burnt brick while the outer surface was made of un-burnt brick, which was then covered with a thick layer of plaster.

3. The art of the stupa reached its climax during the Ashokan period.

Which of the above statement is/are correct?