A customer rejects a deliverable because it fails to meet the agreed-upon quality specifications. The project team investigates the issue and determines that vendor-provided parts are of fault,but the vendor refused to correct it.What should the project manager review? 客户拒绝了一项交付成果，因为它不符合约定的质量规格，项目团队调查该问题，并确定供应商提供的零件有问题，供应商拒绝纠正这种情况。项目经理应该审查什么？ ◑A.Service level agreement (SLA) established with the vendor与供应商订立的服务水平协议（SLA） ◑B.Procurement management plan and contract agreements采购管理计划和合同协议 ◑C.Internal quality assurance reports内部质量保证报告 ◑D.Resource management plan资源管理计划
