The properly marked source document states:
(S) There will be 80,000 troops deployed to Ilkeborg.

The new document states:
(S) Forty-thousand troops will approach Ilkeborg from the west, and another 40,000 will approach from the east.

What concept is used to derivatively classify the statement in the new document?

a. Directed by
b. Contained in
c. Revealed by
d. Classification by Compilation

The answer is b (contained in)

Explanation:Derivative Classification refers to the process of restating in a different and often new form previously classified information, and ensuring the newly outcome (material) is consistent with the previous original information and contains the source markings .

In the example given above ,option b is more suitable because the new outcome which is 40,000 is a part of the source marking ,we derive the figure based on the source .

Therefore we say ,it is contained in the source

Option d is incorrect because classification by compilation involves taking two unclassified information and merging together .

B

Explanation:

Contained in

The concept of "contained in" includes No additional interpretation or analysis is needed, to determine the classification of the information. It is normally incorporated into new document. . Classified information is normally extracted from an authorized source into a new document.