What is the possible effect of a mutation causing the insertion of two nucleotides in the middle of the trpL region well before the polypeptide stop codon?

The mutation could result in the production of a truncated TrpL protein, which could interfere with the regulation of the trp operon.

The mutation could cause a frameshift, leading to the production of a completely different protein with a different function than the original TrpL protein.

The mutation could cause premature termination of translation of the trpL gene, leading to the production of a non-functional or partially functional TrpL protein.

All of the above.

None of the above.