Let \( x=(5 \sqrt{2}+7)^{19} \), then \( \mathrm{x}\{\mathrm{x}\}\{ \).\( \} .denotes the fracti...

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Let \( x=(5 \sqrt{2}+7)^{19} \), then \( \mathrm{x}\{\mathrm{x}\}\{ \).\( \} .denotes the fractional \) part of \( x \) ) is equal to
(a) \( 2^{19} \)
(b) \( 3^{19} \)
(c) 0
(d) 1
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