Assume there are three actions possible $\{$a$0,$ a$1,$ a$2\}$ the true reward $($r$)$ for each action is as follows:

r$($a$0)=0\mathrm{.}9$

r$($a$1)=2\mathrm{.}5$

r$($a$2)=-0\mathrm{.}5$

What is a$*($best action$)$ is equal to$?$