LSA Type 7 is generated by an ASBR inside a Not So Stubby Area (NSSA) to describe routes redistributed into the NSSA. LSA 7 is translated into LSA 5 as it leaves the NSSA. These routes appear as N1 or N2 in the routing table inside the NSSA. Much like LSA 5, N2 is a static cost while N1 is a cumulative cost that includes the cost upto the ASBR -> LSA Type 7 only exists in an NSSA area.
Answer B is not correct because using “passive-interface” command on ASW1 & ASW2 does not prevent DSW1 & DSW2 from sending routing updates to two access layer switches.