Several vendors have proposed solutions for your current project. Your organization has made it a requirement that the lowest price solution will be...

 the one that is selected to deliver the project. The vendor was selected and the project was completed successfully and handed off to the maintenance organization for ongoing product support. A year into the product’s release, it has become apparent that the maintenance costs are much higher than what the organization had anticipated. What did the project manager probably forget to do?

a. Validate the vendor's credentials

b. Perform adequate quality testing

c. Earned value cost forecast

d. Life cycle costing