A machine with a single general purpose accumulator register $(AC)$ is using a $16$ bits single

address instruction format with the four left most bits are reserved for the opcode. The

content of the IR$,$ AC and main memory is shown in the following figure.

Determined the content of the AC after execution of the instruction in IR provided the

instruction is using:

a$)$ Immediate addressing mode

b$)$ Direct addressing mode

c$)$ Indirect addressing mode

Describe the process used to arrive at the answers.

$[8$ marks$]$