Suppose a router receives an IP packet containing $700$ data bytes and has to forward the packet to a network with maximum transmission unit of $180$ bytes.Assume that IP header is $20$ bytes long and DON'T FRAGMENT is set to $0.$

$(1)$ The IP packet will be divideded into $$

fragments.

$(2)$ The offset value of the $2$nd fragment is $$

$.$

$(3)$ The offset value of the last fragment is $$

$.$

$(4)$ The last IP fragment contains $$

data bytes.