In OCI, how can you restrict access for two NFS clients where one has READ access and the other has READ/Write access?

The correct choice involves using File Storage NFS Export Options to control access for different NFS clients effectively. NFS (Network File System) export options allow for fine-grained access control based on the client IP addresses. By configuring NFS export options, you can specify which clients can read or write to the file system.

For instance, you can define one export with read-only permissions for the first client while creating another export with read/write permissions for the second client. This method is particularly effective in situations where you need to separate access levels among multiple clients connecting to the same storage resource, providing a streamlined and efficient means of managing permissions directly at the filesystem level.

Using VCN security rules primarily focuses on controlling network-level access rather than file-level permissions. OCI Identity Access Management is used for managing user permissions to OCI resources, but it does not specifically address NFS file share access controls. NFS security settings would generally reference broader security mechanisms but do not provide the same level of granularity regarding specific client permissions as the NFS export options do. Therefore, the use of NFS export options is the most applicable and precise way to restrict access between clients in this scenario.