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When a disk image is created on a Mac, it can function as a removable volume, and this is why that answer is correct. A disk image acts like a physical disk that can be mounted and unmounted. Once the disk image is created, it can be opened and accessed similarly to how one would interact with an external hard drive or USB flash drive. Users can store files, applications, or data in it, and when not needed, they can unmount the disk image, making it an efficient tool for both storage and file management.

Although some disk images can have permission settings that restrict access to certain users, by default, they are not limited to the creator alone or meant for exclusive access through Time Machine. Additionally, disk images are not permanently locked and can be shared or copied, depending on the settings chosen during the creation process. Thus, the disk image's ability to function as a removable volume aligns correctly with its intended use and characteristics on a Mac.