What is the difference between float and free float in CPM?

What is the difference between float and free float in CPM?

• A. Total float is the delay that can be absorbed without delaying the next activity.
• B. Free float is the delay before the project finish.
• C. Total float is the overall allowable delay before affecting project finish; free float is the delay without delaying the subsequent activity.
• D. Float only applies to material delivery times

Answer: (C)