The true statement is:
Neutral mutation occurs when a mutation in a DNA results in the same sequence as the original.
Neutral mutations are changes in the DNA sequence that do not affect the organism's ability to survive and reproduce. Often, these mutations occur in non-coding regions or result in synonymous changes (where the resulting amino acid does not change) in coding regions, leading to no significant effect on the organism's phenotype.
The other statements provided are inaccurate descriptions of neutral mutations.