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 have slack in this project?
Definitions:
Complaint
A formal statement initiating a lawsuit, alleging facts and legal reasons for action against the defendant.
Clerk
An administrative or office worker, often responsible for handling paperwork or performing general office duties.
Summons
a legal document issued by a court or administrative agency requiring the recipient to appear in court or respond to a legal proceeding.
Arbitration
A method of resolving disputes outside the courts, where the parties present their case to a neutral third-party arbitrator who makes a binding decision.
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