Which of the following activity is non-critical in the project given in the table below?
| Activity | Predecessor | Duration | Cost slope | Workers/day |
| P | -- | 3 | 20 | 5 |
| Q | -- | 4 | 30 | 4 |
| R | P | 4 | 25 | 4 |
| S | P, Q | 3 | 25 | 5 |
| T | R | 3 | 15 | 5 |
| U | R, S | 4 | 55 | 4 |
1
P
2
R
3
T
4
U
Which of the following activity is non-critical in the project given in the table below?
| Activity | Predecessor | Duration | Cost slope | Workers/day |
| P | -- | 3 | 20 | 5 |
| Q | -- | 4 | 30 | 4 |
| R | P | 4 | 25 | 4 |
| S | P, Q | 3 | 25 | 5 |
| T | R | 3 | 15 | 5 |
| U | R, S | 4 | 55 | 4 |