The thickness of the web of a mild steel plate girder is less than d/200. If only one horizontal stiffener is used, it is placed at

• A. the neutral axis of the section
• B. 2/3rd of the depth of the neutral axis from the compression flange
• C. 2/5th of the depth of the neutral axis from the compression flange
• D. 2/5th of the height of the neutral axis from tension flange