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 infinite interval; {x|x < -9}; (-?, -9)
B. closed infinite interval; {x|x ? -9}; (-?, -9]
C. closed infinite interval; {x|x ? -9}; [-9, ?)
D. open infinite interval; {x|x > -9}; (-9, ?)
Answer: D
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