A.) In vertex form, f(x) = 2(x - 2)² + 1 and therefore has a minimum value of 1.

B.) In vertex form, f(x) = 2(x - 2)² + 1 and therefore has a minimum value of -2.

C.) In vertex form, f(x) = 2(x - 2)² + 4.5 and therefore has a minimum value of 4.5.

D.) In vertex form, f(x) = 2(x - 2)² + 4.5 and therefore has a minimum value of -2.