Among the following four options, the one that belongs to the illegal integer constant is

-0 1 and -0 18 are wrong. -0F 1, the first two-signs are wrong, 0 starts with octal, followed by F is wrong; -0 18 is octal starting from 0, but octal has no 8, so it is wrong. This question seems to ask "It's all wrong". 00 1 1 of A is right, and it is decimal 9; 0 17 of b is correct, and it is a decimal15; The 999 of C is correct; D is only wrong in three items.

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