The diagram below depicts the address space of a process on a Linux x$86$ system. Low$-$order addresses $($e$.$g$.$

$000000000)$ are shown at the bottom of the diagram. High$-$order addresses $($e$.$g$.0xffffffff)$ are shown

at the top of the diagram.

Progra

stz

$($a$)$ What is the purpose of region A $?$

$($b$)$ What is the purpose of region B $?$

$($c$)$ What is the purpose of region C $?$

$($d$)$ What is the purpose of region D $?$