A tech company plans a major update for its flagship software, focusing on one of four improvements: speed, new features, security, or cost reduction. There is a $0\mathrm{.}6$ probability that customers will favor the update and a $0\mathrm{.}4$ chance they won't. The payoffs below show the estimated additional annual revenue $($in millions of dollars$)$ based on customer reception.

$\backslash$table$[[,$Favorable Reception,Unfavorable Reception$],[,0\mathrm{.}60,0\mathrm{.}40],[$Enhance Speed,$20,5],[$Add New Features,$35,-10],[$Improve Security,$18,15],[$Reduce Costs,$22,6]]$

What is the optimal decision according to Minimax?

Add New Features

Reduce Costs

Enhance Speed

Improve Security