Relocation project has a furniture auction activity that requires 12 days to complete and currently has 4 days of slack time. The project team has proposed a change which will decrease furnitute auction activity time from 12 days to 7 days. The project manager claims that if implemented, the change will increase the furniture auction slack time and will not shorten the project duration. Is the manager's claim and reasoning valid? Yes /No and Explain in detail.