What is the output of this code?

Question

Question from challenges:

int a=1;
for(int i=0; i<20 ; i++){
a++;
}
cout<<a;

Answer 1

21

Answer 2

21 because the loop runs 20 times and increments a 20 times in which a already has a value of 1
soo..1+....20=21

Answer 3

thks 👍