Hari (H), Gita (G), Irfan (I), and Saira (S) are siblings (i.e. brothers and sisters). All were born on $1^{st}$ January. The age difference between any two successive siblings (that is born one after another) is less than $3$ years. Given the following facts:
- Hari's age $+$ Gita's age $>$ Irfan's age $+$ Saira's age.
- The age difference between Gita and Saira is $1$ year. However, Gita is not the oldest and Saira is not the youngest.
- There are no twins.
In what order were they born (oldest first)?
- HSIG
- SGHI
- lGSH
- IHSG