The correct answer is: All of the above.
Vaisakha Purnima is a full moon day in the Hindu calendar that falls in the month of Vaisakha. It is a day of great significance for Buddhists, as it marks the birth, enlightenment, and death of Gautama Buddha.
Gautama Buddha was born in Lumbini, Nepal, on a full moon day in the month of Vaisakha. He was raised in a wealthy family, but he renounced his wealth and privilege at the age of 29 to seek enlightenment. After six years of study and meditation, he attained enlightenment under the Bodhi tree in Bodh Gaya, India. He spent the next 45 years teaching others the path to enlightenment, and he died on a full moon day in the month of Vaisakha.
Vaisakha Purnima is a time for Buddhists to celebrate the life and teachings of Gautama Buddha. It is also a time for them to reflect on their own lives and to make resolutions to improve themselves.