A technician is searching through a storage locker and finds a DSL modem. What is the purpose of this device?

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Question:
A technician is searching through a storage locker and finds a DSL modem. What is the purpose of this device?

It connects the network of a user to the digital infrastructure of a phone company, providing always-on service.
It is placed between two or more networks and protects data and equipment from unauthorized access.
It is an all-in-one security appliance that includes IDS/IPS functionality as well as stateful firewall services.
It connects networks and forwards traffic to remote networks by using IP addressing information.