$x^4+x^2+1$ এর উৎপাদক কোনটি ?

$\left(x^{2}+x+1\right)\left(x^{2}+x-1\right)$

$\left(x^{2}-x+1\right)\left(x^{2}+x-1\right)$

$\left(x^{2}+x+1\right)\left(x^{2}-x+1\right)$

$\left(x^{2}+x+1\right)\left(x^{2}+x+1\right)$