Which statements regarding the Application layer protocols FTP $($File Transfer Protocol$)$ and TFTP $($Trivial File Transfer Protocol$)$ INCORRECT? $($More than one statement applies$).$

a$.$ FTP is a secure protocol.

b$.$ TFTP is a simple protocol for transferring files and has little file management capability.

c$.$ FTP uses TCP $($Transmission Control Protocol$)$ ports $20$ and $21.$ Port $21$ is for users sending control commands and Port $20$ is for transferring file data.

d$.$ FTP is a client$/$server protocol used to transfer files and manage files across a network.

e$.$ TFTP uses UDP $($User Datagram Protocol$)$ port $72.$