'Sammaka Sambuddha' means to be totally self-informed of noble truth at one's own initiative through three levels of wisdom: Which of the following is correct?

1. He has attained knowledge on what is essential to know, such as the noble truth
2. He has attained knowledge by performing all the necessary works by himself
3. He carefully forsakes what is to be abandoned

• ai and ii
• bi and iii
• cii and iii
• di, ii and iii