Final answer:
The sum of A, B, C, and D is 4.
Step-by-step explanation:
The sum of A, B, C, and D can be obtained by looking at the addition sum provided. Since all the digits in the sum are different, we can assume that each digit represents a different value. From the provided options, we need to find the correct sum. Let's analyze the sum:
A + B = B + A
From this equation, we can conclude that A and B are the same digit. So, let's assume A = 2 and B = 2. Now, let's substitute these values into the equation:
2 + 2 = 2 + 2
Simplifying, we get 4 = 4, which is a true statement. Therefore, the sum of A, B, C, and D is 4.