The difference of two complex numbers $$(x_1 + iy_1)$$ and $$(x_2 + iy_2)$$ is

A

$$(x_1 + y_1) + i(x_2 + y_2)$$

B

$$(x_1 + y_1) - i(x_2 + y_2)$$

C

$$(x_1 - x_2) - i(y_1 - y_2)$$

D

$$(x_1 - x_2) + i(y_1 - y_2)$$