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Choose which one among the following statement is incorrect?

A) HCF of two co-primes a and b is 1.

B) LCM of two co-primes m and n is mn.

C) By using Euclid's division lemma for two numbers 155 and 345, we get 345 = 155 \[\mathbf{\times }\] 2 + 35.

D)  The remainder, when the square of any prime number greater than 3 is divided by 6, is 1.

E) None of these