Which statement is true？（）  

• A、 A flow layout can be used to position a component that should resize horizontally when the  container is resized.
• B、 A grid layout can be used to position a component tat should maintain a constant size even when  the container is resized.
• C、 A border layout can be used to position component that should maintain a constant size even when  the container is resized.
• D、 The grid bag layout can be used to give a grid-like layout which differs from the normal grid in that individual rows and columns can have unique sizes.
• E、 If two components are placed in the same column of a grid bag layout， and one component resizes horizontally， then the other component must resize horizontally.