The answer is C and E. iSCSI and NFS.
iSCSI is a network protocol that allows block-level storage to be shared over a network. This makes it a good choice for sharing disks between the nodes of a database cluster.
NFS is a file-level sharing protocol that allows files to be shared over a network. This makes it a good choice for sharing files between the nodes of a database cluster.
The other protocols listed are not suitable for sharing disks between the nodes of a database cluster.
CIFS and FTP are file-level sharing protocols that are not designed for sharing block-level storage.
RAID 10 is a type of RAID that provides fault tolerance, but it does not allow disks to be shared between nodes.
FC is a Fibre Channel protocol that is designed for high-performance storage, but it is not as widely supported as iSCSI or NFS.