89. A resource-limited project is one in which- 资源约束项目是指 [ ]
a. Functional managers do not allocate the required number of resources at the time required by the project manager 职能经理不是在项目经理要求的时间内分配所需的资源数量 b. The project must be finished as soon as possible but without exceeding a specific level of resource usage 该项目必须尽快完成,但所用的资源不能超过某一具体范围 c. The project must be finished by a certain time using as few resources as possible 在一定时间之内完成并尽量少使用资源的项目 d. The resources assigned to the Project are limited in their ability to perform 资源配置有限,不足以完成项目