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若函数\(f\left ( {x} \right )=\left \{ \begin{gathered} {\left ( {\frac {1} {2}} \right )^{x}，x<1} \\ {a+\left ( {\frac {1} {4}} \right )^{x}，x\geq 1} \end{gathered} \right .\) 的值域为 \(\left ( {0，a} \right )\) ，则\(a\)的最大值为（ ）
A.\(\frac {1} {4}\)
B.\(\frac {1} {2}\)
C.1
D.2
参考答案：B
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