Let the address stored in the program counter be designated by the symbol X1. The
instruction stored in X1 has an address part (operand reference) X2. The operand
needed to execute the instruction is stored in the memory word with address X3.An
index register contains the value X4.What is the relationship between these various
quantities if the addressing mode of the instruction is (a) direct; (b) indirect; (c) PC
relative; (d) indexed?
