Artificial intelligence
Natural language understanding is used in:

natural language front ends
natural language interfaces
(b) and (c) above
All of these
text understanding systems

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Artificial intelligence
Artificial intelligence is

a set of computer programs that produce output that would be considered to reflect intelligence if it were generated by humans.
the embodiment of human intellectual capabilities within a computer.
the study of mental faculties through the use of mental models implemented on a computer.
None of these
All of these

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