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In a voice communication system with 20 lines, let X be the number of lines in use at a particular time.
Determine the range (possible values) of the random variable X.
A. {0, 1, 2, ..., 20}
B. {1, 2, 3,, 20}
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C. {1, 3, 5, 19}
D. {2, 4, 6, ..., 20}
E. None of the other choices is correct