$1.$ A magazine offers the following schedule of subscription prices:

Length of Subscription

$1$ year $2$ years

$3$ years

Price

$$10$

$$19$

$$28$

Assume you are certain that you want to receive the publication for the next $3$ years and that the schedule of subscription prices will not change during that time. You pay for each subscription at the beginning of the first year in which it is received. Assuming a $10\%$ annual interest rate, rank the four possible subscription strategies in terms of their financial desirability.