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      Question

      Bitmap indexes are most efficient

      when:
      A Columns are high cardinality Correct Answer Incorrect Answer
      B Columns are low cardinality Correct Answer Incorrect Answer
      C Table has few rows Correct Answer Incorrect Answer
      D Table has no primary key Correct Answer Incorrect Answer
      E Foreign key constraints exist Correct Answer Incorrect Answer

      Solution

      Bitmap indexes are efficient for low-cardinality attributes (e.g., gender, status).

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