When the OSPF opeational state is ExStart, what does it mean?

a$.$ Routers have converged databases

b$.$ Hello packets are received that contain the sending router$$s ID

c$.$ No hello packets received

d$.$ LSRs and LSUs are used to gain additional route information

e$.$ Negotiate master$/$slave relationship

f$.$ Routers exchange DBD packets

g$.$ Used to elect a DR and BDR on ethernet link