Which type of communicator uses RJ-45 jacks?

The correct answer is the type of communicator that utilizes RJ-45 jacks, which are physical connectors commonly associated with Ethernet networking. RJ-45 jacks are standard connectors for network cables, specifically twisted pair cables used in local area networks (LANs).

An Internet communicator is designed to connect alarm systems to the Internet, allowing for remote monitoring and control via network connections. The RJ-45 jack supports the necessary data transmission for Internet communications, making it integral for Internet-based alarm systems which require direct Ethernet connectivity.

While the other types of communicators may use different methods of communication, they do not use RJ-45 jacks. Analog communicators typically transmit signals using phone lines and do not utilize network connections. Digital communicators may use other types of connections but are not specifically tied to RJ-45. Wireless communicators rely on radio signal transmission rather than wired connections, further distinguishing them from the Internet communicator that requires this specific type of jack.