Factor x ^ 3 - 4x ^ 2 + 7x - 28 by grouping. What is the resulting expression?

O (x ^ 2 + 7)(x - 4)

O (x ^ 2 - 7)(x + 4)

O (x ^ 2 + 4)(x - 7)

O (x ^ 2 - 4)(x + 7)