The key difference between an intranet and an extranet is that an intranet

Multiple Choice

uses technology based on current Internet standards, while an extranet uses technology based on Internet$2.$

is closed to public access, while an extranet allows selected outsiders access to the network.

allows many different organizations to share data and resources, while an extranet is limited to only two organizations.

uses public lines to transmit information, but an extranet uses private lines.