表示图中坐标轴上阴影部分的正确表达式是？

Question

         |         |                    |  / / / /
         | / / / / |                    |  / / / /
         | / / / / |                    |
_________________________________________________________>
         a          b                   c                XA.(x>=c)&&(x>=a)&&(x<=b)
B.(x>=c)||(x>=a)&&(x<=b)
C.(x>=c)||(a<=x<=b)
D.(x<=c)&&(a<=x<=b)