AdeveloperchoosestoavoidusingSingleThreadModelbutwantstoensurethatdataisupdatedinathread－safemanner.Whichtwocansupportthisdesigngoal？（）

A.Storethedatainalocalvariable.
B.Storethedatainaninstancevariable.
C.StorethedataintheHttpSessionobject.
D.StorethedataintheServletContextobject.
E.StorethedataintheServletRequestobject.

【参考答案】

A, E