Which of the following is/are true? (V) (A) The sum of two rational expressions is always a rati...

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Which of the following is/are true?
(V)
(A) The sum of two rational expressions is always a rational expression.
(B) The difference of two rational expressions is always a rational expression.
(C) \( \frac{p(x)}{q(x)} \) is in its lowest terms if \( \operatorname{LCM}[p(x), q(x)]=1 \).
(D) Reciprocal of \( \frac{-2 x}{x^{2}-1} \) is \( \frac{x^{2}-1}{2 x} \).
(a) A, B
(b) A, B, D
(c) A, C
(d) A, B, C
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