How do programs identify the different instances of the X11 server?

On a machine running several X servers, how do programs identify the different instances of the X11 server?
A. By a fixed UUID that is defined in the X11 configuration file.
B. By a display name like: 1.
C. By the name of the user that runs the X server like x11:bob.
D. By a device name like /dev/X11/xservers/1.
E. By a unique IPv6 address from the fe80::/64 subnet.

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