How do TCP and UDP differ in the way they guarantee packet delivery?
A.TCP uses checksum, acknowledgement, and retransmissions, and UDP uses checksums only. B.TCP uses retransmissions, acknowledgement and parity checks and UDP uses cyclic redundancy checks only. C.TCP uses checksum, parity checks, and retransmissions, and UDP uses acknowledgements only. D.TCP uses two-dimensional parity checks, checksums, and cyclic redundancy checks and UDPuses retransmissions only.正确答案A
