Reference:

http://support.microsoft.com/default.aspx?kbid=826852&product=sms2003

'By default, SQL Server uses TCP (not UDP) port 1433 to listen on TCP/IP. To change the port, run SQL Server Setup on the server and then click

REF:

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/coprompt/cp_sqlservr_4apa.asp

I Agree that your answer (and mine) should be valid. (Answer no.1)