单选题What code， inserted at line 21， is called prior to a session being migrated to a different JVM assuming the web application containing MyExample is deployed in a container which supports distributed applications？（）A public void valueUnbound（HttpSessionEvent ev）{...}B public void sessionPassivated（HttpSessionEvent ev）{...}C public void sessionDidActivate（HttpSessionEvent ev）{...}D public void sessionWillPassivate（HttpSessionEvent ev）{...}
单选题
What code， inserted at line 21， is called prior to a session being migrated to a different JVM assuming the web application containing MyExample is deployed in a container which supports distributed applications？（）
A
public void valueUnbound（HttpSessionEvent ev）{...}
B
public void sessionPassivated（HttpSessionEvent ev）{...}
C
public void sessionDidActivate（HttpSessionEvent ev）{...}
D
public void sessionWillPassivate（HttpSessionEvent ev）{...}
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