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Main Question Set 12 Extracting Information - Dealing with an uncertain number of columns Review Later Often when importing data, we are dealing with an uncertain number of columns. This may be caused by blank ghost columns or by having a variable number of date columns, for example. The solution usually depends on the type of file you are working with. Which of the following are appropriate methods to mitigate the risks of working with an uncertain number of columns. Select TWO. When removing blank ghost columns, use the "Remove Other Columns" For a CSV file, remove the column count from the file reference leg. "Columns 19.7. Use the column header to filter out blank values