What does the character mean in the first column on the main task sheet below? (A or Total Slack Leveling1 X X X Leveling Duration Free Slack Delay O edays 55 days O days O edays 15 days O days O edays 20 days 0 days O edays 17 days O days O edays 20 days Odays Oedays 12 days 11 days O edays 20 days 3 days. Oedays 20 days 3 days O edays Odays days > O days O days o days 3 days O days 11 days 3 days 3 days odays N ch XYZ X,Y,Z 5.6.74