The greatest common factor of each term in the expression 20 x minus 16 x y is 4x. Which choice shows the expression written as a product?
4 x (5 x minus 4 x y)
4 x (5 minus 4 y)
4 x (5 minus 16 x y)
4 x (5 x minus 16 x y)

please help will give brainliest to the first person who answers.