Three flags each of different colours are available for a military exercise, Using these flags different codes can be generated by waving <br> I. Single flag of different colours <br> II. Any two flags in a different sequence of colours. <br> III. three flags in a different sequence of colours. <br> The maximum number of codes that can be generated is.

A. 15

B. 6

C. 18

D. 9

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