Which of these following subject indexing systems are using Artificial Intelligence techniques?
(i) NLP-based subject indexing system
(ii) Knowledge representation-based subject indexing system
(iii) Expert system-based subject indexing
(iv) Key-term-alphabetical indexing system
1
(ii), (iii) and (iv)
2
(i), (ii) and (iii)
3
(i), (ii) and (iv)
4
(i), (iii) and (iv)
5
Question Not Attempted