A. a measure that uses the following formula: SUM(Sales[sales_amount])

B. a measure that uses the following formula: SUMX(FILTER('Sales', 'Sales'[sales_amount] > 0)),[sales_amount])

C. a calculated column that uses the following formula: ABS(Sales[sales_amount])

D. a calculated column that uses the following formula: IF(ISBLANK(Sales[sales_amount]),0, (Sales[sales_amount]))