Which statement about the OSPF incremental SPF feature is true?
A. If type 1 or type 2 LSA changes occur in the calculating router itself, the full SPF is performed even when OSPF incremental SPF is enabled.
B. Routers with incremental SPF enabled and routers with incremental SPF not enabled cannot function in the same domain.
C. If the OSPF incremental SPF feature is enabled, the entire SPT must be recomputed even when the tree remains unchanged inside of the OSPF area.
D. The OSPF incremental SPF features allows for the system to recompute only the affected part of the tree when type 3 or type 5 LSA changes occur.
