What Is the Route of Water in the Water Vascular

What is the route of water in the water vascular system of a starfish?

A) Water enters through the madreporite into the ring canal and from thence into the radial canals to the ampullae and finally into the tube feet.
B) Water enters the madreporite into the radial canals and from thence into the ring canal,then the ampullae and finally into the tube feet.
C) Water enters the madreporite into the ampullae and from thence into the ring canal,then the radial canals to the ampullae and finally into the tube feet.
D) Water enters the ampullae and then goes to the tube feet and from thence to the radial canals,then the ring canal,and finally exits through the madreporite.
E) Water enters the ring canal,then goes into the radial canals,and finally through the madreporite to the ampullae and tube feet.