An application or user experiences poor performance， yet examination of the nfsstat -c output indicates no or very few timeouts and retransmits. This means that the client is receiving responses from the server as fast as it is asking for them. What is the first thing to be checked？（）

A.There is an appropriate number of NFS daemons running on the server machine
B.There is an appropriate number of biod daemons running on the client machine
C.The server is not CPU bound
D.There is an appropriate number of biod daemons running on the server machine