You administer a company's SharePoint Online environment. The environment hosts several site collections that are used t

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You administer a company's SharePoint Online environment. The environment hosts several site collections that are used to store documents that contain sensitive customer information.
A user in the customer relationship department must share a document that contains scheduling and project information with multiple external vendors.
The document contains scheduling and project information.
You need to ensure that the external vendors can access and collaborate on the document.
What should you do?

A. Share the site containing the collaboration document and require sign-in.
B. Share the document and do not require sign-in.
C. Create a document library for the document and require sign-in.
D. Share the document and require sign-in.