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What is the correct answer?

4

The initial configuration of the queue is a,b,c,d (a is the front end). To get the configuration d,c,b,a one needs a minimum of ?

A. 3 additions and 2 deletions

B. 2 deletions and 3 additions

C. 3 deletions and 4 additions

D. 3 deletions and 3 additions