What are the types of linkages?

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What are the types of linkages?
« on: April 28, 2016, 02:27:17 PM »
Question: What are the types of linkages?

Options are:

A.    Internal and External   
B.    External, Internal and None
C.    External and None   
D.    Internal

Correct answer is:

B.    External, Internal and None