A TE buffer contains 200 mM Tris and 50 mM EDTA. Given the stock solutions-0.5 M Tris and 0.5 M EDTA, volumes of stock solutions required to make 1 liter of buffer solution are respectively.
(1) 400 ml, 100 ml
(3) 500 ml, 125 ml
(2) 200 ml, 50 ml
(4) 100 ml, 25 ml
