In libraries, the process of digitization began with services in the following order :
A. Periodicals and large reference works
B. Cataloguing services
C. Periodical indexing and abstracting services
D. Book publishing
Choose the correct answer from the options given below :
1
A, B, C, D
2
B, C, A, D
3
C, B, D, A
4
D, A, B, C