In the bar chart planning____________?

Consider the following statements?
1. interdependence of the operations cannot be portrayed
2. progress of work can be measured
3. spare time of the activities can be determined
4. schedule cannot be updated
A. 1,2 and 3 are correct
B. 1 and 4 are correct
C. 2, 3 and 4 are correct
D. 1,2 and 4 are correct