A company must perform a maintenance project consisting of seven activities.The activities, their predecessors, and their respective time estimates are presented below: 
Using CPM, which activities make up the critical path?
Definitions:
Service Department
A service department is a unit within an organization that provides support services to other departments, rather than directly contributing to revenue.
Operating Department
A department in which the central purposes of the organization are carried out.
Direct Method
An approach to preparing a cash flow statement where actual cash flows from operating activities are listed directly.
Computer Workstations
Dedicated computing devices or areas designed for technical or professional work, often involving high-performance tasks.
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