Which of the following describes Winlink?

Winlink is a global radio email system that allows amateur radio operators to send and receive internet email using RF. This makes it an invaluable tool for emergency communications when standard internet infrastructure is unavailable. To accomplish this, Winlink relies on various forms of Packet Radio, including traditional AX.25 packet on VHF/UHF, as well as robust digital protocols like PACTOR or VARA on the HF bands. Because it bridges the gap between internet email servers and wireless radio stations across multiple frequency bands (VHF, UHF, and HF), all of the provided statements accurately describe the Winlink system.