Factorize fully x ^ 3 + 8y ^ 3

○ (x + 2y)(x ^ 2 + 2xy + 4y)
○ (x - 2y)(x ^ 2 + 2xy + 4y)
○ (x + 2y)(x - 2y)²
○ (x+2y) (x² - 2xy +4y²)​