7. For the van Deemter equation and band broadening terms, which of the followingstatements are correct?(1) Multiple path present in an open tubular column.(2) Longitudinal diffusion increases with diffusion coefficient of solute.(3) Extra column band broadening depends on length and radius of connecting tubing.(4) Equilibration time in stationary phase increases with thickness of stationary phase fim.(5) Equilibration time in mobile phase depends on radius of open tubular column.Your answer:
(A) (2), (3), (4) and (5)；
(B) (2), (4) and (5)；
(C) (3), (4) and (5)；
(D) (2) and (5)；
(E) The statements are all correct.