Refer to the exhibit. In which way does router R1 operate differently than router R2?

R1 would send Type 1 LSAs at minimum to describe its links; Type 2 is only if it's a DR. R2 would send Type 1 and potentially Type 2, in addition to Type 7 for NSSA.

R1, as a general OSPF router, sends Type 1 (Router) LSAs to describe its own links and Type 2 (Network) LSAs if it's a Designated Router on a multi-access segment. R2, likely an ABR for an NSSA, generates Type 1 and Type 2 LSAs (if DR) within its connected areas and originates Type 7 (NSSA External) LSAs to advertise external routes into the NSSA.

Both routers would send Type 1 LSAs at minimum to describe their own links within OSPF.

Type 5 LSAs are External LSAs originated by ASBRs into standard areas, not NSSAs which use Type 7. R1 typically wouldn't send Type 5 or 7 unless it's an ASBR in a non-NSSA context.