A full state backup is the appropriate choice when an engineer needs to perform a backup and restore in Cisco UCS for disaster recovery purposes. This type of backup includes a snapshot of the entire system and is saved as a binary file. Importantly, full state backups are encrypted, ensuring that passwords and other sensitive information are not stored as clear text12. While TFTP (Trivial File Transfer Protocol) is not secure by itself, the encryption of the full state backup file provides the necessary security for the passwords within the backup.
References :=
* Cisco documentation on "Backing Up and Restoring the Configuration" provides detailed information on the different backup types and their contents1.
* Cisco UCS Manager Administration Management Guide 4.2, which mentions the encryption of full state backups

The import function is available for all configuration, system configuration, and logical configuration files.
You can perform an import while the system is up and running. An import operation modifies information on the management plane only.
Some modifications caused by an import operation, such as a change to a vNIC assigned to a server, can cause a server reboot or other operations that disrupt traffic.
Reference:
https://www.cisco.com/en/US/docs/unified_computing/ucs/sw/gui/config/guide/141/UCSM_GUI_C onfiguration_Guide_141_chapter43.html#concept_D789E16C90724AEFB99D565574E45AD5

Explanation
A, B, F, D, C, E

The Network File System (NFS) is an application where the user can view, store and update the files on a remote device. NFS allows the user to mount all or a part of a file system on a server.
NFS uses Remote Procedure Calls (RPC) to route requests between the users and servers.
Reference:
https://www.cisco.com/c/en/us/td/docs/routers/nfvis/config/3-7-1/nfvis-config-guide-3-7-1/nfvis- config-guide_chapter_01100.html