The following system is consistent when

$not{p}^{{?}^{?}}r$

$p{r}^{{?}^{?}}$notq

$pvvqr$

Select one:

a$.p=$ False, $q=$ True, $r=$ True

b$.p=$ True, $q=$ False, $r=$ True

c$.$ The system is not consistent

d$.p=$ False, $q=$ True, $r=$ True