In a genetic engineering investigation, a double-stranded DNA segment containing $12 \times 10^3$ nucleotides that codes for a particular polypeptide is transcribed and then translated. What is the total number of amino acids in this polypeptide?
- A$6 \times 10^3$
- B$4 \times 10^3$
- C$2 \times 10^3$
- D$1 \times 10^3$