Which two IS-IS features meet the ISP requirements when changes happen on the network?

An ISP has hundreds of routers that run IS-IS on its network. The ISP is currently redesigning the network, to improve performance and convergence. Which two IS-IS features meet the ISP requirements when changes happen on the network? (Choose two.)
A. IP Event Dampening
B. Bidirectional Forwarding failure detection
C. tuning of IS-IS hello parameters
D. tuning of SPF PRC and LSP generation exponential backoff timers
E. IS-IS fast flooding of LSPs

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