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When a column has an extension of WITH DEFAULT NULL and a unique index is created on this column, what will be the effects on the possible null values in that column?

C & F
There is still a single null allowed, since it is unique as such.
Nulls are no longer allowed, since nulls aren’t unique.
It has no influence on the possible null values; DB2 doesn’t consider nulls when it comes to an index.
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