Final answer:
The term for sending traffic to a special IP address that multiple systems can receive is multicast (option B), which allows for efficient data distribution to many users at once.
Step-by-step explanation:
The term that allows one system to send traffic to a special IP address that is received by multiple systems is called multicast (option B). When data is sent using a multicast IP address, it is delivered to a group of destination computers simultaneously.
This technique is efficient for streaming media and other types of data to multiple users without sending separate copies to each user. The other terms listed, such as netmask, subnet, and network, relate to different aspects of network addressing and routing but do not describe the process of sending data to multiple recipients with a single transmission.