Question: Select all reason ( s ) why the LABEL column does not meet the requirements to be selected as the primary key. You may assume

Select all reason(s) why the LABEL column does not meet the
requirements to be selected as the primary key. You may assume
that the missing value in the 5th row is a null rather than an empty
string:
It has repeated values
It has values containing text
It is not a candidate key
It has a null value
It has values containing spaces
Select all reason(s) why the LABEL column does not meet the

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