Neon Printers has set up a full network of laptops for the purpose of running multiple printing projects simultaneously. It has contracted Theo Solutions to provide network security solutions while protecting its network from certain traffic. Analyze which of the following is best applicable in this scenario.

a$.$ Using a proxy server

b$.$ Using a host$-$based firewall

c$.$ Using an HIDS

d$.$ Using a network$-$based firewall