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What are the essential components of normal forest?

[A].	It is an ideal against which an actual forest may be compared	[B].	Normal increment "the increment laid on by a normal forest"
[C].	Normal age class distribution "A complete series of age classes in such proportions as will permit equally yields by volume from annual or periodic felling under given rotation and silvicultural system	[D].	All of the above

Answer: Option D