Client1 Needs to Read File X from Huawei OceanStor 900

Client1 needs to read file X from Huawei OceanStor 900 and the node that responds to the read request is node A. Choose the process, which of the analysis is correct:

A) If the system has monitored the file X has been cached on Node B, the client client1 can read the file directly from Node B
B) If the system monitors that node B has cached file X, then node A can read the file from node B.
C) After HUAWEI OceanStor 9000 processes the request for reading the file X from client1, the system reserves the message on both node A and node B.
D) If the system monitors that node A has cached file X, then node A only caches the data of file X and does not cache its verification data