The upper control limits for the GCC will be ____________ for the x chart.

• A. UCL= ( bar{ bar{x}}+A_2 overline{R} )
• B. UCL= ( bar{ bar{x}}-A_2 R )
• C. UCL= ( bar{ bar{x}}-A_2 overline{R} )
• D. UCL= ( bar{ bar{x}}+A_2 R )