The estimate Big Theta (g(x)) of f1 + f2(2), such that fi(x) = x3 + x+8 and f2(x) = - 1 O A. 0(2) O B. None of the choices O C. (24) OD. 0(2) For sets A an B, if |A3| = 27 and B2 = 49, then A x B equals: O A. 10 O B. 15 O C. 21 O D. 49 If A is an integer set and the interval notation A= (-3, 2), then A has the following elements: O A. A= {-2,-1, 0, 1, 2} O B. A= (-3, -2,-1, 0, 1} O C. A= (-3, -2, -1, 0, 1, 2} O D. A= (-2,-1, 0, 1}