Consider the following statements:

1. Parinirvana refers to complete Nirvana.
2. Nirvana refers to complete ending of suffering due to the extinguishing of greed, hatred and delusion.
3. Samsara refers to the wheel of life.
4. Maitreya refers to the appearance on the Earth, achievement of complete enlightenment, and teaching of pure dharma.

Which of the above statements are correct?

Statement 1: It is the correct statement. The concept of the Sanskrit word Parnirvana is the Final Nirvana that is attained upon the death of the physical body. Parinirvana is also sometimes called Maha-parinirvana which means Great Final Nirvana. Therefore, this day is commemorated as the day that the Buddha physically died and entered the final state of Parinirvana (or Maha-parinirvana). The day is also sometimes called The Buddha's Day of Final Extinguishment of the Causes of Suffering. Statement 2: It is the correct statement. The term Nirvana is usually translated and understood as meaning Enlightenment. However, Nirvana literally means to extinguish or to blow out and refers to the complete ending of suffering due to the extinguishing of greed, hatred and delusion. Statement 3: It is the correct statement. Samsara is the Wheel of Life and refers to the cyclical stages of existence that are characteristic of reincarnation or transmigration (birth-death-rebirth). Statement 4: It is correct statement. Maitreya is a bodhisattva who in the Buddhist tradition is to appear on Earth, achieve complete enlightenment, and teach the pure dharma. According to scriptures, Maitreya will be a successor of the historic Sakyamuni Buddha (Siddhartha Gautama Buddha). Hence, the correct option is 4.