Solution: A. Review the estimates with the designated team.
It's crucial to ensure that task duration estimates are as accurate as possible. The project manager should review the estimates with the designated project team to align expectations, identify discrepancies, and allow necessary adjustments before the project schedule is finalized. By reviewing the estimates with the actual team, the project manager can ensure that the project schedule is realistic and achievable.
The other options are not as effective.
Checking task durations for previous projects may not be helpful because every project is different and may have different challenges and constraints.
Updating the risk register is typically done as part of risk management, not specifically during the scheduling phase. Without confirming realistic estimates, the risk register may not accurately reflect risks.
Requesting approval from the project sponsor should be done after the project schedule has been finalized. The project sponsor may not have the same level of technical expertise as the actual team, so they may not be able to accurately assess the feasibility of the task duration estimates.