Which of the following descriptions of the open source OpenStack Glance component is correct?

Which of the following descriptions of the open source OpenStack Glance component is correct?
A . Modifying an instance that is started based on an image is actually modifying the image
B . Glance provides the ability to discover, register, and retrieve virtual machine images
C . Virtual Machine Instance images provided by Glance can only be placed in object storage provided by Swift
D . You can launch only one instance from the same image

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Answer: B