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 > -1}; (-1, ?)
B. open infinite interval; {x|x < -1}; (-?, -1)
C. closed infinite interval; {x|x ? -1}; (-?, -1]
D. closed infinite interval; {x|x ? -1}; [-1, ?)
Answer: C
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