What's the default NFS 3 proto for mounting?

Hello,
Can you, please, explain if the defaults, in order, are: rdma, tcp, udp?
If so, how's /etc/netconfig is used after all?

...
proto=netid | rdma

             By default, the  transport  protocol  that  the  NFS
             mount  uses  is  the  first available RDMA transport
             supported both by the client and the server.  If  no
             RDMA  transport  is found, then it attempts to use a
             TCP transport or, failing that, a UDP transport,  as

SunOS 5.11           Last change: 8 Mar 2011                    5

System Administration Commands                      mount_nfs(1M)

             ordered  in  the /etc/netconfig file. If it does not
             find a connection oriented transport,  it  uses  the
             first available connectionless transport.