Which two of these are true about TFTP? (Choose two.)
A.
TFTP includes a basic username/password authentication mechasim.
B.
While "putting" files via TFTP is possible. It is good practice to disallow it, because TFTP lacks access control mechanisms.
C.
TFTP uses a very basic "stop and wait" mechanism for flow control, for which each packet needs to be acknowledged before the next one is sent.
D.
TFTP root directories need to be world-readable and -writable due to the lack of security controls in the protocol.
E.
TFTP can list remote directory contents, but only if advanced options (as defined in RFC 2347) are negotiated between client and server at initial connection time.