b$.$ With an example distinguish between physical address, logical address and offset address. If $CS=2000h,DS=3000h,SS=4000h,ES=5000h,Bx=0030h,BP=0020h,$ Find the physical address for i$)$ MOV AL$,[$BP$]$

ii$)$ MOV CX$.B,x$

iii$)$ Add AX$,20[$BX$]$

Explain the following addressing modes of $8086.$