While attempting to start an application in an X Window System environment, the following error occurs:
Error: Can't open display
What most likely led to this error?
A. The application is not an X application.
B. It is the wrong version of the application.
C. The application was compiled with the wrong graphics library.
D. The administrator has used "su -" to log into the current account.
Answer: D
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CompTIA
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