110. What type of code is used for DSC transmissions?

A 7 bit code with a constant ratio of 4/ 3 between the 1s and 0s.
A 7 bit code followed by an error check character at the end.
A 10 bit code followed by an error check character at the end.
A 10 bit code with 7 bits used for information and 3 bits used for error correction .

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