What is an IP address actually associated with? Which of the following statements is true regarding an IP address? $($Zero$,$ one or more of the following statements is true$).$a$.$It is not necessary for a device using the IP protocol to actually have an IP address associated with it$.$b$.$An IP address is associated with an interface.c$.$If a router has more than one interface, then it has more that one IP address at which it can be reached.d$.$If a host has more than one interface, then it has more that one IP address at which it can be reached.