Refer to the PERT diagram below,where the numbers next to the arrows refer to the number of days required for completion of the corresponding activity.What is the critical path? 
Definitions:
Total Benefit
The complete gain obtained from consuming a good or service.
Patent System
A legal system granting inventors exclusive rights to their inventions, preventing others from making, using, selling, or distributing the patented invention without permission.
Technology
The application of scientific knowledge for practical purposes, especially in industry and the design of machinery or equipment.
Negative Externality
An economic situation where a third party suffers costs or disadvantages as a result of a transaction between others, often related to pollution or environmental impact.
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