Giải phương trình \({{\sin }^{2}}x-\left( \sqrt{3}+1 \right)\sin x\cos x+\sqrt{3}{{\cos }^{2}}x=0?\)             

• A. 
  \(x=\frac{\pi }{3}+k2\pi \text{ }\left( k\in \mathbb{Z} \right).\)   
• B. 
  \(x=\frac{\pi }{4}+k\pi \text{ }\left( k\in \mathbb{Z} \right).\)
• C. 
  \(\left[ \begin{align} & x=\frac{\pi }{3}+k2\pi \\ & x=\frac{\pi }{4}+k2\pi \\ \end{align} \right.\text{ }\left( k\in \mathbb{Z} \right). \)
• D. 
  \(\left[ \begin{align} & x=\frac{\pi }{3}+k\pi \\ & x=\frac{\pi }{4}+k\pi \\ \end{align} \right.\text{ }\left( k\in \mathbb{Z} \right).\)