In troubleshooting a network connectivity problem, Lisa attempted to ping Google, and the attempt failed. Lisa then attempted to ping $8\mathrm{.}8\mathrm{.}8\mathrm{.}8($which is the IP address for Google$$s DNS servers$),$ and that attempt was successful.

What might be the issue here?

$1$ point

a$.$ Bad connection to the default gateway

b$.$ Modem failure

c$.$ DNS server configuration issue

d$.$ None of the above