Simplify the following Boolean functions to a minimum

number of literals:

i$.p^{\text{'}}q{r}^{\text{'}}+p{q}^{\text{'}}r+qr$

ii$.A{B}^{\text{'}}C+A^{\text{'}}{D}^{\text{'}}+B^{\text{'}}CD+C{D}^{\text{'}}$

iii. $(y+z)(x^{\text{'}}+y^{\text{'}})$

iv$.xyz+x^{\text{'}}+xy{z}^{\text{'}}$