Explanation

The stop codons are :

1. UAA
2. UAG
3. UGA

A stop codon is a sequence of three nucleotides (a trinucleotide) in DNA or messenger RNA (mRNA)

That signals a halt to protein synthesis in the cell.

There are 64 different trinucleotide codons:

• 61 specify amino acids 
• 3 are stop codons