An engineer wants to steer machinery via a serial communication line. She needs 16 different commands, hence she uses a genuine (normal) 4-bit binary code (called Code A). To make commands more easily distinguishable, she adds another 0 as most significant bit, hence turning her code into a 5-bit code. This code is called Code B.

She tries the code. Due to communication errors it doesn't work reliably.

She decides to make up another code (which we call Code C). It adheres to the following rules:

1) Start from Code A

2) Triplicate all 0s, hence turning each 0 into 000

3) Duplicate all 1s, hence turning each 1 into 11

4) Add leading zeros until you have 12-bit (if needed)

a) Does Code B have error detection capabilities or incomplete single error detection capabilities (meaning only some errors can be detected)? If incomplete: What would need to be changed to turn it into 5-bit error detection code?