Wordpress challange exercise in CKAD

I am not able to create volume with nfs . In Wordpress exercise because of nfs required “server” , what host or iP in should give .

the nfs server name is : nfs01, this is in the architecture diagram and is accessible from the worker nodes
master ssh node01 node01 ping nfs01
PING nfs01 (172.17.0.9) 56(84) bytes of data.
64 bytes from nfs01 (172.17.0.9): icmp_seq=1 ttl=64 time=0.354 ms
64 bytes from nfs01 (172.17.0.9): icmp_seq=2 ttl=64 time=0.631 ms
^C
— nfs01 ping statistics —
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.354/0.492/0.631/0.140 ms
node01 $