The formula for density index Iᴅ is ______

• A. (ee_{max} – e)
• B. \(\frac{(e_{max} – e)}{(e_{min}-e)}\)
• C. \(\frac{(e_{max} – e_{min})}{(e_{max}-e)}\)
• D. \(\frac{(e_{max} – e)}{(e_{max}-e_{min})}\)