$(1)$ What is the purpose of the subnet mask?

$4$ To specily the bit positions used to identify the network and the subnet masks A

$4$

To specify the bit positions used to identify the network med the rutin t tits $5$

$5$

To specify the bit positions used to identify the network and the host addresses $C$

$1$

To specify the bit positions used to identify the network and the IP address range $\frac{?}{\text{b}\text{a}\text{r}}(grad)$