Arrange the following Buddhist events/texts in the correct chronological order of their origin or compilation:
A. Buddha attains enlightenment
B. Compilation of the Tipitaka
C. Ashoka's pillar inscription at Lumbini
D. Composition of the Dipavamsa in Sri Lanka
1
A, C, B, D
2
A, B, C, D
3
B, A, C, D
4
A, B, D, C