Given below are two statements : One is labelled as Assertion A and the other is labelled as Reason R : Assertion A : ATP is used at two steps in glycolysis. Reason R : First ATP is used in converting glucose into glucose-6-phosphate and second ATP is used in conversion of fructose-6-phosphate into fructose-1, 6-diphosphate. In the light of the above statements, choose the correct answer from the options given below :

1. A. Both A and R are true and R is the correct explanation of A.
2. B. Both A and R are true but R is NOT the correct explanation of A.
3. C. A is true but R is false.
4. D. A is false but R is true.

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