Let s,-1 for n e n. then which one of the following is true for the sequence (s,).? (a) s.) converges in q (b) s,is cauchy sequence but does not converge in the

Let s,-1 for n e N. Then which one of the following is True for the sequence (s,).? (A) s.) converges in Q (B) s,is Cauchy sequence but does not converge in the subsequence s. sconvergent in R, only when k is even natural number (D) s,) is not a Cauchy sequence.