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Find the number of strings over the alphabet {a, b, c, d} that satisfy the following condition Length 4, begins with a and ends with b or c O A 2x 4 x 4 x 2 = 64 O B. 4 x 4 x 4 x 4 = 256 OC.1x 4 x 4 x 2= 32 OD. 1x 4 x 4 x 1= 16