electronic system simulation I need the answer for this question please

? How can you differentiate an encoder from a decoder The output of an encoder is a binary code for 1-of-N input The output of a decoder is a binary code for zero output The output of a decoder is a binary code for 1-of-N input O N The output of a decoder is a binary code for N-of-1 output O a The output of an encoder is a binary code for N-of-1 output