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You are given the graph ofa function f. y (D Determine the intervals where the graph of f is concave upward and where it is concave downward. [Enter your answers using interval notation.) concave upward concave downward Effect of Advertising on Bank Deposits The following graphs were used by the CEO of a local savings bank to illustrate what effect a projected promotional campaign would have on its deposits over the next year. The i'uncb'ons 01 and DZ give the projected amount of money on deposit with the bank over the next 12 months with and without the proposed promotional campaign, respectively. y ($) Y=D|m ,V = Dz\") r (monihs) 12 (D (a) Determine the signs of 0'19), D'ZEt), D"1(t), and 0"2(t) on the interval (0, 1.2). 9.1\") 0.1\".) owl\") Uni\") |-Seled VI |-Selec1- Vi l-Select VI |-Select- VI (b) What can you conclude about the late of change of the growth rate of the money on deposit with the bank with and without the proposed promotional campaign? 0 with or without the promotion, deposits will increase at the same rate. 0 With or without the promotion, deposits will decrease at the same rate. 0 without the promotion, the deposits will increase at an increasing rate whereas with the promotion, the deposits will increase at a decreasing rate. 0 with the promotion, the deposits will increase at an increasing rate whereas without the promotion, the deposits will increase at a decreasing rate. 0 with the promotion, the deposits will increase at a steady rate whereas without the promotion, the deposits will decrease at a steady rate