What kind of uploading method does the MA5680T load the package file when using the BIOS upgrade?

If the MA5680T does not start properly (non-hardware problems, the system keeps restarting), usually we can use the BIOS upgrade method to end.

What kind of uploading method does the MA5680T load the package file when using the BIOS upgrade? (Multiple Choice)
A . ftp
B . tftp
C . Xmodem
D . wftp

Answer: ABC