Arrange the following class numbers according to colan classification ($$6^{th}$$ edition).
A. 2 Og R
B. 2 'N
C. 2
D. 2 a
Choose the correct answer from the options given below:

A

D, C, A, B

B

C, D, A, B

C

D, C, B, A

D

D, A, B, C