The precedence relations and duration (in days) of activities of a project network are given in the table. The total float (in days) of activities e and f , respectively, areActivityPredecessorsDuration (days)a-2b-4ca2db3ec2fc4gd,e5

• A. 0 and 4
• B. 1 and 4
• C. 2 and 3
• D. 3 and 1