Consider the following statements regarding the concept of the Bodhisattva in Buddhism:

1. The concept is central to Hinayana Buddhism.

2. A Bodhisattva delays their own final salvation in order to help all sentient beings attain enlightenment.

3. A Bodhisattva is described as a compassionate being who is on the path towards Buddhahood.

Which of the statements given above are correct?