A New Version of the Primary OS Used by a Company

Multiple Choice

A new version of the primary OS used by a company has been released. Due to some significant changes in the OS, a system administrator wants to see which remotely accessible services are enabled by default to access the security risk prior to upgrading to the new version. Which of the following utilities should the administrator use?

A) Cipher program
B) Port scanner
C) Telnet client
D) Packet sniffer