Ports 1024 to 49151 has been defined as REGISTERED PORTS by IANA.
A registered port is a network port (a sub-address defined within the Internet Protocol, in the range 1-65535) assigned by the Internet Assigned Numbers Authority (IANA) (or by Internet Corporation for Assigned Names and Numbers (ICANN) before March 21, 2001) for use with a certain protocol or application.
Ports with numbers lower than those of the registered ports are called well known ports; ports with numbers greater than those of the registered ports are called dynamic and/or private ports.
Ports 0-1023 - well known ports Ports 1024-49151 - Registered port: vendors use for applications Ports >49151 - dynamic / private ports
The other answers are not correct
Reference(s) used for this question: http://en.wikipedia.org/wiki/Registered_port

Section: Network and Telecommunications
Explanation/Reference: HARRIS, Shon, All-In-One CISSP Certification Exam Guide, 2001, McGraw-Hill/Osborne, page
467; SMITH, Richard E., Internet Cryptography, 1997, Addison-Wesley Pub Co.

The advantages of SSO include having the ability to use stronger passwords,
easier administration as far as changing or deleting the passwords, minimize the risks of
orphan accounts, and requiring less time to access resources.
Source: KRUTZ, Ronald L. & VINES, Russel D., The CISSP Prep Guide: Mastering the
Ten Domains of Computer Security, 2001, John Wiley & Sons, Page 39.