Which of the following is correct hydrometer reading equation?

• A. R=Rh‚Äö√Ñ√∂‚àö√ë‚àö¬• +Cm ¬¨¬®¬¨¬± CL -Cd
• B. R=Rh‚Äö√Ñ√∂‚àö√ë‚àö¬• +cm +CL -Cd
• C. R=Cm ¬¨¬®¬¨¬±Rm ‚Äö√Ñ√∂‚àö√ë‚àö¬® Cd + CL
• D. R =Rh +Cm ¬¨¬®¬¨¬± Cd + CL