A project consists of four activities with information as shown in the table.What is the overall variance of the project's duration? 
Definitions:
Writing
The act or process of composing text or documenting information in a durable medium.
Offeror
The party in a contract who makes the offer to enter into an agreement.
Offeree
The person to whom an offer is made, typically in contract law.
Terminates
Refers to the act of bringing something to an end or conclusion.
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