qBittorrent official forums

I've done some searching but I am mainly getting posts about other people confused over how the watch directory works.
I would like to know exactly what qbittorrent will do if I have multiple watch directories with the "download here" option checked.
Will it:

1) Download the incomplete files to the watch directory and does not append the files with an "in progress" extension?
2) Download the incomplete files to the watch directory and does append the files with an "in progress" extension?
3) Download the incomplete files to the "incomplete" directory and then move it to the watch directory?

Cheers.

2)

Thanks.