Designing Cisco Network Service Architectures (ARCH) (#73)

An engineer is attempting to improve OSPF network performance and discovers that the entire SPT recomputes whenever a type 1 or type 2 LSA is received within an area. Which action can optimize SPT operations?

Tune LSA throttling thresholds.
Enable incremental SPF.
Configure totally stubby areas throughout the domain.
Summarize networks on all ABRs.