Which codon is the code for the amino acid histidine?

The data base code (which is a single letter base code) for Histidine is H and its corresponding DNA codons are

a) CAT

b) CAC

Where C stands for Cytosine, A stands for Adenine, and T stands for Thymine

These DNA codon of Histidine represents either the 3 letter codons (out of the total 64 codons existing) or it represents one of the three stop codons that signals the end of sequence.

Amino Acid SLC DNA codons