Which of the following are expression is in sum$-$of$-$products form. Select all that apply.

For all of the following a$,$ b$,$ c$,$ and d are literals, a$\text{'}$ is a way to represent $($not a$),$ ab is a way of expressing the boolean term $($a and b$),$ and a$+$b is a way of expressing the boolean term $($a or b$).$

Question $8$ options:

abc' $+$ abc $+$ ab'c

$($a $+$ b$)($b$\text{'}+$ c$)$

a$($ a$\text{'}$b $+$ c $)$

abc' $+$ c

a $+$ b