Question $14($Mandatory$)(4$ points$)$

The input combination that drives the output of a NOR gate S$-$R flip$-$flop to Q $=0$ and $\frac{?}{\text{b}\text{a}\text{r}}(Q)=0$ is

$S=0,R=1$

$S=1,R=1$

$S=1,R=0$

$S=0,R=0$

Question $17($Mandatory$)(4$ points$)$

The inputs on a $7474$ D flip$-$flop are S$,$ R$,$ D and clock. Which of these are asynchronous?

only D

S and R

only S

all of the above