Let $f:R\to R$ be a continuous function and $f\left(x\right)=f\left(2x\right)$ is true $\forall x\in R\dot{}$ If $f\left(1\right)=3,$ then the value of ${\int }_{-1}^{1}f\left(f\left(x\right)\right)dx$ is equal to (a)6 (b) 0 (c) $3f\left(3\right)$ (d) $2f\left(0\right)$

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