n is the least natural number that must be added to 23 so that the resulting number is a perfect square, the value of n is:

1. 7

2. 2

3. 5

4. -7

n is the least natural number that must be subtracted from 23 so that the resulting number is a perfect square, the value of n is:

1. 7

2. 2

3. 5

4. -7