This is only for people proficient in c++. I got an output of 6 for the following code snippet, however, the answer seems to be 5. I do not understand how, please provide and in-depth explanation and run through the code step by step.

What is the exact output of the following code segment? function 1 creates variable alpha with value 5 creates variable delta with value 1 calls function2 and passes alpha and delta in this order prints the sum of (alpha + delta) function2 (receives alpha by reference and delta by value) increments delta by 1 decrements alpha by 1 calls function3 and passes alpha and delta in this order function3 (receives alpha by value and delta by reference) increments delta by 1 decrements alpha by 1