Let \( [\mathrm{x}] \) be the greatest isteger less than or equal t...

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Let \( [\mathrm{x}] \) be the greatest isteger less than or equal to \( \mathrm{x} \). Then, at which of the following point(s) the function \( f(\mathrm{x})=\mathrm{x} \cos (\pi(\mathrm{x}+[\mathrm{x}])) \) is discontinuous ?
\( \mathrm{P} \)
(A) \( x=-1 \)
(B) \( \mathrm{x}=0 \)
(C) \( x=2 \)
(D) \( x=1 \)
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