Questão de Pré-cálculo

What is the correct way to perform addition and subtraction with rational numbers?

With the same denominator, add and/or subtract the numerators.
With different denominators, find a common denominator and then add and/or subtract the numerators.

A
Only the first statement is correct.
B
Only the second statement is correct.
C
Both statements are correct.
D
Both statements are incorrect.

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