Which of the following export options, when specified in /etc/exports, will tell the server to use the NFSv4 Pseudofilesystem?

Which of the following export options, when specified in /etc/exports, will tell the server to use the NFSv4 Pseudofilesystem?

A.
fsid=2

B.
fsid=0

C.
fsid=3

D.
fsid=1