Question $4$: A plant manager considers the operational cost per hour of five machine alternatives. The cost per hour is sensitive to three potential weather conditions: cold, mild, and warm. The following table represents the operations cost per hour for each alternative$-$state of nature combination:

$\backslash$table$[[,$States of Nature,$],[,$Weather$-$related cost per hour,$],[$Alternatives$,$Cold cost$/$day$,$Mild cost$/$day$,\backslash$table$[[$Warm$],[$cost$/$day$]],],[$Machine $1,$$$42,$$$40,$$$45,],[$Machine $2,$$$45,$$$42,$$$47,],[$Machine $3,$$$40,$$$35,$$$54,],[$Machine $4,$$$60,$$$30,$$$48,],[$Machine $5,$$$45,$$$40,$$$45,]]$

Using the optimistic criterion, which alternative is best?