GATE 2012 The tester now tests the program on all input

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GATE 2012 
The tester now tests the program on all input strings of length five consisting of characters ‘a’, ‘b’, ‘c’, ‘d’ and ‘e’ with duplicates allowed. If the tester carries out this testing with the four test cases given above, how many test cases will be able to capture the flaw?

(A) Only one
(B) Only two
(C) Only three
(D) All four

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