How many mrna codons would be required to specify 4 amino acids

The three-letter nature of codons means that the four nucleotides found in mRNA  A, U, G, and C can produce a total of 64 different combinations. Of these 64 codons, 61 represent amino acids, and the remaining three represent stop signals, which trigger the end of protein synthesis.

HOPE THIS HELPEDX

answer; the correct answer is (beta)

i think its the first one