The correct response regarding whether 2021 is a leap year is:
2021 is not a leap year.
To expand, a leap year occurs if:
- It is divisible by 4;
- However, if it is divisible by 100, it must also be divisible by 400 to be a leap year.
Since 2021 is not divisible by 4, it does not qualify as a leap year. Therefore, if passed to a method that checks for leap years, the output would indicate that 2021 is not a leap year.