$$(4x^3y - 6x^2y^2 + 4xy^3 - y^4)$$ can be expressed as:

A

$$(x - y)^4 - x^4$$

B

$$(x + y)^4 - y^4$$

C

$$(x + y)^4 - x^4$$

D

$$x^4 - (x - y)^4$$