Your investment portfolio consists entirely Google stock. Suppose that the risk$-$free rate is $4\%,$ Google stock has an expected return of $14\%$ and a volatility of $35\%,$ and the market portfolio has an expected return of $12\%$ and a volatility of $18\%.$ Assume that the CAPM assumptions hold.

What alternative investment has the lowest possible volatility while having the same expected return as Google?