On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?

On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?
A . When KDM starts
B . When a user’s X session exits
C . When KDM crashes
D . When X is restarted
E . When X crashes

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Answer: B