Given the set sketched on the number line, identify the type of interval (open, closed, half-open, open infinite, closed infinite), write the set using set-builder notation, and write the set using interval notation.
A. open interval; {x|1 < x < 7}; (1, 7)
B. closed interval; {x|1 ? x ? 7}; [1, 7]
C. half-open interval; {x|1 ? x < 7}; [1, 7)
D. half-open interval; {x|1 < x ? 7}; (1, 7]
Answer: D
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