ANSWER :
64 possible outcomes
EXPLANATION :
The code has 3 letters only from A, B, C, and D
There are 4 options.
For the first letter, we have 4 options
For the second letter, we also have 4 options
and for the third letter, we have 4 options.
The total number of possible codes is the product of the number of options in each position of the letter.
That will be :
4 x 4 x 4 = 64
