Suppose that Symantec is a small firm that has developed anti-virus computer software. Symantec currently earns $3 million per year in profits from selling its software. Dell informs Symantec that it is considering installing the software on every new computer it sells. Dell currently earns profits of $30 million but expects to sell more computers at a higher price if it can install Symantec software. Dell first chooses whether to offer Symantec $30 or $20 for each copy of its software, and then Symantec responds by either accepting or rejecting the offer. The strategies and corresponding profits (in millions) for Dell (D) and Symantec (S) are depicted in the decision tree to the right. What is the Nash equilibrium of the game