The domain of the function f(x)=sqrt(10-...

The domain of the function `f(x)=sqrt(10-sqrt(x^4-21 x^2))` is a. `[5,oo)` b. `[-sqrt(21),sqrt(21)]` c. `[-5,-sqrt(21)]uu[sqrt(21),5]uu{0]` d. `(-oo,-5]`U`[5,oo)`

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