Which network protocol was developed by Novell for use in its network operating system?

The correct answer is IPX, which stands for Internetwork Packet Exchange. This protocol was specifically developed by Novell for use in its NetWare network operating system. IPX is part of the network layer in the OSI model and was designed to facilitate communication over a network, allowing various nodes within a local area network (LAN) to send and receive packets efficiently.

IPX played a significant role in the networking environment during the 1980s and 1990s, especially in business and educational settings where Novell's NetWare was widely adopted. It was particularly advantageous for handling small data packets and offered a straightforward method for network communications, especially before the widespread adoption of TCP/IP.

Understanding this context helps clarify why IPX is the correct choice, as the other protocols mentioned serve different functions and were not specifically developed by Novell for its operating system. TCP/IP, for instance, is a suite of protocols used widely on the internet and in intranets, whereas HTTP and FTP are protocols designed for web communication and file transfer, respectively.