Algebra 2: How do I factor this expression?

Question

4x^4-6x^2+2

Answer 1

4x^4 - 6x^2 + 2
2(2x^4 - 3x^2 + 1)
2(2x^2 - 1)(x^2 - 1)
2(2x^2 - 1)(x - 1)(x + 1)