2 tan n2 25. (A) (B) 2 (C) D) 26. Let 0 < a, < b,. For n 2 1, define a a,b, and b,., = 4tD, Then which one of the followings is NOT TRUE ? (A) Both (a) and (b,) converge, but the limits are not equal. Both (a,) and (b,) converge and the limits are equal. (B) (C) )is decreasing sequence. (D) a) is an increasing sequence.