19. let a = d 0, and for each n22,1et a, and b. be real numbers given by -1) m a 1 2 (log (m) and b, = - m-2 (m)" then which one of the following is true about

19. Let a = D 0, and for each n22,1et a, and b. be real numbers given by -1) m a 1 2 (log (m) and b, = - m-2 (m)" Then which one of the following is TRUE about the sequences a,}and {b,}? (a) Both {a and {b,} are divergent b) a,is convergent andb, is divergent (c) ais divergent and {b,{ is convergent (d) Both a, and {b,are convergent