6. A circuit which translates n input lines into an m-bit code word, where n <= 2^m is defined as a

  1. MUX
  2. DeMUX
  3. Encoder
  4. Decoder
  5. ROM

3 is CORRECT. An encoder is a circuit which converts n lines of input into a m-bit codeword, where n is less than or equal to 2^m.

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