a$.$ Describe the difference between the instruction MOV AX$,1234$ H and MOV AX$,[1234$H$][2$ Marks$]$

b$.$ If the $8086$ execution unit calculates an effective address of $14$ A$3$H and DS contains $7000$ H $.$ What physical address will the BIU produce? $[2$ Marks$]$

$1$c$.$ How many address lines does an $8086$ have? $[1$ Mark$]$