The relationship between overall efficiency \[({{\eta }_{0}})\], mechanical efficiency \[{{\eta }_{mech}}\], and hydraulic efficiency \[({{\eta }_{hyd}})\] of a turbine is:

• A. \[{{\eta }_{0}}\,=\,{{h}_{mech}}\,\times \,{{\eta }_{hyd}}\]      
• B. \[{{\eta }_{0}}\,=\,{{h}_{mech}}\,/\,{{\eta }_{hyd}}\]
• C. \[{{\eta }_{0}}\,=\,{{\eta }_{hyd}}\,/\,{{\eta }_{mech}}\]         
• D. \[{{\eta }_{0}}\,=\,{{\eta }_{mech}}\,-\,{{\eta }_{hyd}}\]