![](https://cos-cdn.shuashuati.com/pipixue-web/2020-1231-2005-12/ti_inject-812ce.png)
The main functions of the OSI reference model physical layer are ().
A.
Physical address definition
B.
Establish end-to-end connection
C.
Transmit bittorrent between terminal devices, defining voltage, interface, cable standard, transmission distance, etc
D.
transfer data from host on one end to host on the other