Question A$2$

Nowadays, modern operating systems have two modes to execute a certain program. The main reason is to protect the O$.$S$.$ itself and other system components.

$($a$)$ What are the TWO modes?

$(2$ marks$)$

$($b$)$ Show the differences between the modes in $($a$)$ for protecting the O$.$S$.$

$(8$ marks$)$