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?
- $x_{\text{u, bal}}$ depends on the grade of concrete only
- $x_{\text{u, bal}}$ depends on the grade of steel only
- $x_{\text{u, bal}}$ depends on both the grade of concrete and grade of steel
- $x_{\text{u, bal}}$ does not depend on the grade of concrete and grade of steel