Which three statements are correct about the differences in IS - IS and OSPF?()
A. IS - IS is more CPU - intensive than is OSPF
B. For greater fine tuning there are more IS - IS timers
C. IS - IS LSP con tains TLV fields and OSPF LSU contains the LSAs
D. New additions to the protocol are easily implemented in OSPF but not with IS - IS
E. OSPF has more area types than does IS - IS