Which of the following is not a part of chat 1 data series
2 legend
3 chat title
4 none of these

4. None of these

Explanation: The elements or part of a chart include the data series which constitutes the data employed in creating the plot, therefore, the data series is the numerical representation of the plotted diagram usually arranged in rows, columns or both. The legend is usually employed in describing the elements such as color and symbols which makes up a plotted figure, chart or map. It ensures that the interpreter or reader is able to understand the visual elements of the chart. The chart title is used to describe the information or name of the chart or plotted figure. It is usually located on top of the chart.

answer; the correct answer is (operating system);