Which of the following statements about connecting devices between LANs is accurate?

Which of the following statements about connecting devices between LANs is accurate?

1. a) Gateway converts the protocols of the first to third layers of the OSI basic reference model
2. b) Bridge relays frames based on IP address
3. c) Repeater extends transmission distance by amplifying the signal between segments of the same type
4. d) Router relays frames based on MAC address