Answer: The correct answer is- Amino acid.
Codon represents a unit of genetic code, which determines a specific amino acid.
It is a sequence of three nucleotides that are present in DNA/RNA sequence and codes for a specific amino acid ( like UUU codes for phenylalanine) during the process of translation. Codon also generates a start signal or stop signal during protein synthesis ( such as AUG is a start codon and UGA is a stop codon)