多项选择题

A.Object o = pageContext.getAttribute（ foo ）；B.Object o……

Given：
3.public class MyTagHandler extends TagSupport {
4.public int doStartTag（） {
5.// insert code here
6.// return an int
7.}
8.// more code here
...
18.}
There is a single attribute foo in the session scope.
Which three code fragments，inserted independently atline 5，return the value of the attribute？（）

A.Object o = pageContext.getAttribute（"foo"）；
B.Object o = pageContext.findAttribute（"foo"）；
C.Object o = pageContext.getAttribute（"foo"，PageContext.SESSION_SCOPE）；
D.HttpSession s = pageContext.getSession（）；Object o = s.getAttribute（"foo"）；

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