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Which of the following statement is correct?

[A].	The sub-base course is composed of hard well burnt clinker natural gravel or any other suitable material excavated at or near the site.	[B].	The base is composed of broken stone and granular material with tar.
[C].	The wearing surface in the case of flexible pavement consists of a mixture of bituminous material and aggregate.	[D].	all of the above

Answer: Option D