What does IANA do?

The correct choice highlights the primary function of the Internet Assigned Numbers Authority (IANA), which is to manage and allocate unique identifiers globally. One of its key responsibilities is the assignment of IP addresses to networks. This process ensures that each device connected to the internet can be uniquely identified, which is crucial for routing data between different networks.

By managing IP address spaces, IANA plays a vital role in the overall functionality and organization of the internet, preventing conflicts that could arise from duplicate addresses. Its work is essential to maintaining a structured addressing system that supports the vast and ever-growing internet infrastructure.

The other options do not accurately represent IANA's roles. While cybersecurity is critical for internet operations, IANA's primary responsibilities do not include enforcing cybersecurity measures. Creating websites and developing programming languages falls outside of IANA's scope, as its focus is specifically on the allocation of numerical resources, including IP addresses and protocol parameters.