auto-increment addressing mode

Question

Which of the following is/are true of the auto-increment addressing mode?

I.  It is useful in creating self-relocating code.
II. If it is included in an Instruction Set Architecture, 
    then an additional ALU is required for effective address 
    calculation.
III.The amount of increment depends on the size of the data
     item accessed.

Answer 1

The amount of increment depends on the size of the data item accessed.

Answer 2

If it is included in an Instruction Set Architecture, 
    then an additional ALU is required for effective address 
    calculation.