What of the following statements is true regarding a display manager?

What of the following statements is true regarding a display manager?
A . A display manager handles remote X11 logins only and has no purpose on a system that is not attached to a network.
B . The display manager is configured in the X11 configuration file xorg.conf.
C . There is only one display manager X11DM that must be started on all systems running X11.
D . After system startup, the display manager handles the login of a user.
E . Without a display manager, no graphical programs can be run.

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Answer: D