Find the domain of `sqrt(10-sqrt(x^4-21 x^2))`

Find the domain of sqrt(10-sqrt(x^(4)-21x^(2)))

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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)

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)

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)

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