Explanation:

The intelligence exhibited by computer systems is known as 'Artificial Intelligence' (AI). Option (c) 'artificial' is the correct term used to describe this field, distinguishing it from natural or human intelligence. Options (a) 'pure' and (b) 'human' are incorrect descriptors in this context. Option (d) 'all' is incorrect as only (c) is appropriate. Option (e) 'none of these' is incorrect because (c) is the precise term.