If the staff reading at point A = ha and at a point B = hb. The correct staff reading should have been Ha and Hb, then the correction difference in elevation between A and B is given by _____

• A. ha ‚Äö√Ñ√∂‚àö√ë‚àö¬® hb
• B. ha + hb
• C. Ha ‚Äö√Ñ√∂‚àö√ë‚àö¬® Hb
• D. Ha + Hb