Mutations that occur at the end of a gene may alter the sequence of the gene and

Question:

Mutations that occur at the end of a gene may alter the sequence of the gene and prevent transcriptional termination.
A. What types of mutations would prevent p-independent termination?
B. What types of mutations would prevent p-dependent termination?
C. If a mutation prevented transcriptional termination at the end of a gene, where would gene transcription end? Or would it end?