Correct Answer : Redundant code
A code which uses more bits for each character then what is necessary is known as Redundant code.
In computer programming, redundant code is source code or compiled code in a computer program that is unnecessary, such as: recomputing a value that has previously been calculated and is still available, code that is never executed (known as unreachable code), code which is executed but has no external effect. A NOP instruction might be considered to be redundant code that has been explicitly inserted to pad out the instruction stream or introduce a time delay.
An error-correcting code (ECC) or forward error correction (FEC) code is a process of adding redundant data, or parity data, to a message, such that it can be recovered by a receiver even when a number of errors (up to the capability of the code being used) were introduced, either during the process of transmission,etc,..
