Which is a characteristic of an add-on that is "available" for applications in Private Spaces but not "installable" in a Private Space?

Which is a characteristic of an add-on that is "available" for applications in Private Spaces but not "installable" in a Private Space?
A . The add-on always runs in the same Private Space as theprovisioning application.
B . The traffic between the provisioning app and the add-on will travel across the public Internet.
C . The add-on will always run in the same region, but not in the same Private Space, as the provisioning application.
D . The add-on’s data will always be stored in the same Private Space as the provisioning application.

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Answer: B