Question $641$ pts For the IP address $10\mathrm{.}64\mathrm{.}17\mathrm{.}4/19,$ how many configurable network, subnet, and host bits exist? Network: $15,$ subnet: $3,$ host: $13$ Network: $15,$ subnet: $12,$ host: $4$ Network: $7,$ subnet: $13,$ host: $11$ Network: $7,$ subnet: $11,$ host: $13$