Which of the following is correct?

A

$$(2x - y)^{2} = 4x^{2} - 4xy + y^{2}$$

B

$$(2x - y)^{2} = x^{2} - 4xy + 4y^{2}$$

C

$$(2x + y)^{2} = x^{2} - 4xy + 4y^{2}$$

D

$$(2x + y)^{2} = 4x^{2} - 4xy + y^{2}$$