GRE Question of the Day (October 3rd)

Company X ordered for security codes to be formed for each of its employees. Codes should be designed such that each code has five characters comprising of 3 letters and 2 digits. If only 3 digits (1,2,3) can be used and only 2 letters (X,Y) can be used for the codes, then how many different codes can be formed such that repetition of the letters and digits is allowed

(a)72
(b)180
(c)360
(d)720
(e)1440