Which folder for PLEX Medias on WDMC?

Which Folder should I take for PLEX ?
I have more Options whith the same Folders on my WDMC.
Thers´s also an root/ntfs Folder on it whith all my Cloud Folders.

Hi, when I had Plex on my EX 2 I only chose where my media files where located, I removed any other folders from the list to avoid Plex to go through all the drive and slow it down.