Artificial intelligence
Natural language understanding is used in:

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

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Artificial intelligence
Weak AI is

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

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