You are the project manager for a project and have received overall cost estimates from three vendors. One of the estimates is significantly higher than similar project work in the past. In this scenario, you should do which of the following? ❍ A. Ask the other vendors about the higher estimate from the third vendor ❍ B. Use the cost estimates from the historical information ❍ C. Discuss the issue with the vendor who submitted the high cost before reviewing the issue with the other vendors ❍ D. Ask the vendor that supplied the high estimate for information on how the estimate was prepared