What is the correct formula for dimensionless rate of climb?

• A. ν=\(\frac{dH/dt}{V_{md}}\)
• B. v=\(\frac{V_{md}}{dH/dt}\)
• C. v=\(\frac{-V_{md}}{dH/dt}\)
• D. v=\(\frac{-dH/dt}{V_{md}}\)