In the Register Indirect addressing mode, the effective address of the datum in the base register or an index register that is specified by the instruction is

• A. \(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {AX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
• B. \(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {BX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
• C. \(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {CX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)
• D. \(EA = \left\{ {\begin{array}{*{20}{c}} {\left( {DX} \right)}\\ {\left( {DI} \right)}\\ {\left( {SI} \right)} \end{array}} \right\}\)