Given the Set Sketched on the Number Line, Identify the Type

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.
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A) open infinite interval; $\{ x \mid x > 1 \} ; ( 1 , \infty )$
B) closed infinite interval; $\{ x \mid x \leq 1 \} ; ( - \infty , 1 ]$
C) closed infinite interval; $\{ x \mid x \geq 1 \} ; [ 1 , \infty )$
D) open infinite interval; $\{ x \mid x < 1 \} ; ( - \infty , 1 )$