C and D. TCP/IP, or Transmission Control Protocol/Internet Protocol, is the basic communication protocol for the Internet and is also used on private networks such as intranets (web environments within a company) or extranets (web environments between two or more business partners or between a vendor and customers). NetBIOS, or Network Basic Input/Output System, is a program that allows computers to communicate on local area networks, or LANs, but does not support transport into wide area networks, or WANs, such as the Internet. Solution C and D. TCP/IP, or Transmission Control Protocol/Internet Protocol, is the basic communication protocol for the Internet and is also used on private networks such as intranets (web environments within a company) or extranets (web environments between two or more business partners or between a vendor and customers). NetBIOS, or Network Basic Input/Output System, is a program that allows computers to communicate on local area networks, or LANs, but does not support transport into wide area networks, or WANs, such as the Internet..