A project management team wants to procure some customized products which are available in identical grade and quality from many vendors．What should be included in the procurement package to ensure that their offers will be comparable ？（）
A．A statement of work describing the needs of the project in sufficient detail to enable vendors to make suitable proposals
B．A statement of work specifying attributes and metrics of the requested deliverables in detal to allow vendors Submission of bids
C．The approved project scope statement，the WBS which should be broken down to work package level and the WBS dictionary
D．The risk management plan and the reports from those risk management reviews which have been made so far
