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Which of these is true about Unique Indexes? Unique index can only be a clustered one but never a non-clustered one Unique index with multiple

Which of these is true about Unique Indexes?

Unique index can only be a clustered one but never a non-clustered one

Unique index with multiple columns is not possible because uniqueness cant be achieved

Unique constraint on a column doesnt allow automatic unique index creation

Unique indexes ensure the index key columns dont contain duplicates

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