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Which of the following is an integer?

A -9
An integer is any positive or negative whole number or zero. Therefore, -9 is an integer. $3477_w9_h38.png$ and 0.5 are not integers because they are not whole numbers. The square root of 42 is approximately 6.48 and therefore not an integer.
B $3477_w9_h38.png$
C 0.5
D $4963_w32_h19.png$