According to $IS \: 456 – 2000$, which one of the following statements about the depth of neutral axis $x_{\text{u, bal}}$ for a balanced reinforced concrete section is correct?

1. $x_{\text{u, bal}}$ depends on the grade of concrete only
2. $x_{\text{u, bal}}$ depends on the grade of steel only
3. $x_{\text{u, bal}}$ depends on both the grade of concrete and grade of steel
4. $x_{\text{u, bal}}$ does not depend on the grade of concrete and grade of steel