1. $The factor of 4x^4+1 is$

• A. $\left(2x^2+2x-1\right)\left(2x^2-2x+1\right)$
• B. $\left(2x^2+2x-1\right)\left(2x^2-2x+1\right)$
• C. $\left(2x^2+2x-1\right)\left(2x^2-2x+1\right)$
• D. $\left(2x^2+2x-1\right)\left(2x^2-2x+1\right)$

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