Answer:
b. You can track changes.
Explanation:
Setting up a workbook to be shared if you are the only one using the workbook is to enable you track the changes that may occur.
When sharing a workbook, you can allow users gain access to it, make changes and then you easily track those changes.
It makes a team to work simultaneously on the same workbook.
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Its the purpose, not the audience the other idiot that answered the question is mad wrong