Question points$)$:

Indicate whether the following Boolean expressions are in Conjunctive Normal

Form $($CNF$)$ or Disjunctive Normal Form $($DNF$)$ or both or neither.

a$)xyz$

b$)x\frac{+}{b}ar(y)\frac{+}{b}ar(z)$

c$)\stackrel{}{x}\frac{+}{b}ar(y)z\frac{+}{b}ar(z)xy$

d$)\stackrel{}{x}+(\frac{?}{\text{b}\text{a}\text{r}}(y)z\frac{+}{b}ar(z)xy)w$