A.True. DUAL is public; any user with SELECT can query it.
B.True. One row, one VARCHAR2 column (DUMMY).
C.False. Fixed at one row.
D.False. Not restricted to SYS.
E.False. One row, one column only.
F.False. Can return expressions, not just constants.
[References:Oracle Database Concepts 23ai, "DUAL Table.", , ]
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