Which of these is a correct expression for the one sided upper cusum?

• A. (C_i^+=min u2061[0,x_i-( _0+K)+C_{i-1}^+] )
• B. (C_i^+=max u2061[0,x_i-( _0+K)+C_{i-1}^+] )
• C. (C_i^+=min u2061[0,( _0-K)-x_i+C_{i-1}^+ ] )
• D. (C_i^+=max u2061[0,( _0-K)-x_i+C_{i-1}^+] )