Which device actively works to prevent collisions by making sure not to send data to a segment that is already busy?

Bridge

Explanation: Bridges are employed in network connections for managing data packets, when transmissions are received, the bridge network makes the decision or filter the transmitted data and makes decision on whether to forward or block the data depending on the destination address on each frame. This prevents unnecessary traffic transmission to a network segment. Bridge networks identifies the amount of traffic in each network segment, making it possible to delineate busy segment from the one's which aren't busy and thereby blocking transmission of data to the busy segment.

answer6-9 screws;