SMTP is based on …………………………………..delivary, contacts on well known port
number……………………………
A. host to host, 23
B. host to host, 25
C. end to end , 23
D. end to end, 80
number……………………………
A. host to host, 23
B. host to host, 25
C. end to end , 23
D. end to end, 80