Within Alteryx

The first few records in a Results window are shown below. The column Date Ordered" has a gray bar beneath it. What does this mean about that column? Record Price Order Number 1 3543234 2 3453576 3 7683453 56.81 67.52 92.81 Date Ordered 2020-05-01 2020-05-01 2020-05-02 Date Delivered 2020-05-03 2020-05-04 2020-05-06 O A. A majority of the values in the column are Null B. Less than half of the values in the column are empty strings O C. Less than half of the values in the column are Null D. A majority of the values in the column are empty strings