How do total float and free float differ in CPM scheduling?

How do total float and free float differ in CPM scheduling?

• A. Total float and free float are the same concept used for schedule margins.
• B. Total float is the time an activity can be delayed without delaying the project finish; free float is the time an activity can be delayed without delaying its successor.
• C. Total float is the time an activity can be delayed without affecting the project start.
• D. Total float is the time an activity can be advanced; free float is the time it can be delayed.

Answer: (B)