Based on the classification tree below, which of the following Silver card holders would the bank classify as an upgrader (assuming they classify those with an upgrade probability estimate of at least .5 as upgraders)?

a. PlatProfile(0) & Purchases = 31.50 b. PlatProfile(1) * c. Purchases = 48.25 d. PlatProfile(0) & Purchases = 34.75

AIM 00ml 0*: mm 1 55.351733 6.3407066 low! Rm M 00ml 0 0.5250 0.5250 21 1 0.050 0.4750 19 m m Com a-z Loom cm (r: W 20 8.90854 1.2253368 20 11003319 0.9797146 Lon! Rm Prob CM low! M. Pub Count 0 0.1500 0.1629 3 0 00000 08321 18 1 08500 08321 I? 0 00000 00349 04236 0.4362 . 10000 0.9125 1 10000 0.9651 0.571! 0.5638 . . 0.0000 00275