Which of the following describes Open Systems Adapter $($OSA$)?$

Question $10$Select one:

A$.$

An input$/$output device that used a program in one system to communicate with a program in another system.

B$.$

A standard protocol for transmitting $3270$ data streams over Telnet.

C$.$

A protocol that allows TCP sockets applications to transparently exploit RDMA.

D$.$

A network controller that you can install in a mainframe I$/$O cage.