Phương trình \(\sqrt 3 \sin 2x - \cos 2x + 1 = 0\) có nghiệm là: 

A. \(\left[ \begin{array}{l}
x = k\pi \\
x = \frac{\pi }{3} + k\pi 
\end{array} \right.\left( {k \in Z} \right)\)

B. \(\left[ \begin{array}{l}
x = k\pi \\
x = \frac{{2\pi }}{3} + 2k\pi 
\end{array} \right.\left( {k \in Z} \right)\)

C. \(\left[ \begin{array}{l}
x = 2k\pi \\
x = \frac{{2\pi }}{3} + 2k\pi 
\end{array} \right.\left( {k \in Z} \right)\)

D. \(\left[ \begin{array}{l}
x = k\pi \\
x = \frac{{2\pi }}{3} + k\pi 
\end{array} \right.\left( {k \in Z} \right)\)