The correct answer to best step to complete while adding space to the c:\ drive is: Create a mount point using space on the second disk.
A new file system, directory, or file is made available at a mount point, which is a directory or file. The mount point for mounting a file system or directory must be a directory, and the mount point for mounting a file system must be a file. The filesystem is accessed from the mount point, which serves as the filesystem's root directory. Until the filesystem is unmounted, the previous content of that particular directory is rendered invisible and inaccessible (detached).
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