In the topology shown, router R$1$ is an ASBR configured to export external routes into OSPF. Assuming that all areas are normal, which of the following statements is TRUE?a$.$ Router R$1$ generates a type$-5$ LSA that is flooded to area $1$ and converted into a type$-4$ LSA by R$3$ before forwarding it to area $0.$b$.$ Router R$1$ generates a type$-4$ LSA that is flooded to area $1$ and converted into a type$-5$ LSA by R$3$ before forwarding it to area $0.$c$.$ Router R$1$ generates a type$-5$ LSA that is flooded to all areas with the help of ABRs R$3$ and R$6.$ Router R$3$ advertises a companion type$-4$ LSA into area $0$ and router R$6$ advertises a companion type$-4$ LSA into area $2.$d$.$ Router R$1$ generates a type$-4$ LSA that is flooded to all areas with the help of ABRs R$3$ and R$6.$ Router R$3$ advertises a companion type$-5$ LSA into area $0$ and router R$6$ advertises a companion type$-5$ LSA into area $2.$