What is the most common difference between a single board computer (SBC) and a controller board?

What is the most common difference between a single board computer (SBC) and a controller board?
A . SBCs typically have connectors for display and input devices while controller boards do not
B . Controller boards have I/O headers and SBCs do not
C . SBCs always have connectors for M2 devices and controller boards do not
D . Controller boards have more powerful processors than most SBCs

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Answer: A