Which of the following services utilize the UDP protocol?

The correct answer highlights the services that utilize the UDP (User Datagram Protocol), which is a communications protocol for computer networks. UDP is favored in situations that require fast, efficient transmission and where speed is more critical than reliability, such as in streaming, online gaming, and voice communication.

When considering the services that utilize UDP, it's important to recognize common protocols that rely on it, such as Domain Name System (DNS), Dynamic Host Configuration Protocol (DHCP), and Network Time Protocol (NTP). These protocols prioritize quick data transmission and can operate without the overhead of establishing a connection, making them suitable for scenarios where data integrity can be sacrificed for speed.

The services numbered in the correct choice have specific functionalities that align with the characteristics of UDP, thus making their operation efficient and suitable under UDP's architecture. This is essential for applications where dropping packets does not significantly impact the overall service quality, such as video streaming or voice over IP.

In contrast, options that suggested different combinations of services either include services that require the reliability of TCP (Transmission Control Protocol) or do not encompass all relevant services that function on UDP. Thus, by selecting the first option, the choices being referenced correctly indicate those services that leverage UDP effectively.