Question: Which of the following can be used to determine whether an index exists? a. DESCRIBE indexname; b. The USER_INDEXES view c. The INDEXES table d.

Which of the following can be used to determine whether an index exists?
a. DESCRIBE indexname;
b. The USER_INDEXES view
c. The INDEXES table
d. The USER_INDEX view
e. All of the above
f. None of the above

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