Which of the following would a company use to limit traffic between subnets on a network?

A repeater operates at Layer 1 and simply amplifies and retransmits all signals without any filtering or traffic limitation capability.

A bridge operates at the OSI Data Link layer (Layer 2) and uses MAC address tables to decide whether to forward or filter frames between two or more network segments, effectively limiting unnecessary traffic from crossing between them. This selective forwarding reduces congestion and isolates broadcast domains to some extent. Among the devices listed, only a bridge has the intelligence to inspect frames and limit inter-segment traffic.

A hub is a Layer 1 device that broadcasts all received traffic to every port, which increases rather than limits inter-segment traffic.

A switch also operates at Layer 2 and can segment traffic, but in the context of this question a bridge is the historically and conceptually correct answer for limiting traffic between two specific subnets.