Pick up the correct statement from the following:

• The duration between the earliest start time of the preceding event and latest finish time of the succeeding event, is called 'float'
• The duration of time by which an activity can be delayed without affecting the succeeding activity, is called free float
• The float which affects neither the processor nor the successor activities, is called independent float
• The difference between total float and free float, is called interfering float
• All the above.