Which of the following statements correctly describes the expression "i++"?

The expression "i++" is known as the post-increment operator in C++. This operator first returns the current value of the variable i, and then increments i by 1. Therefore, when you use "i++" in an expression, the value of i that is returned is the value prior to the increment, and only after that value is used does i get increased. This behavior is fundamental to understanding how post-increment works.

For instance, if i is initially 3 and the expression j = i++ is executed, j would be assigned the value 3, and then i would be incremented to 4. This emphasizes the order of operations where the value is taken before the increment occurs, aligning perfectly with the description provided by the correct answer.