Multiple Choice $2$ points

Which statement is true?

The standard deviation of any portfolio must equal $1\mathrm{.}0.$

The beta of any portfollo must be $1\mathrm{.}0.$

The arithmetic average of the betas for each security held in a portfolio must equal $1\mathrm{.}0.$

The weights of the securities held in any portfollo must equal $1\mathrm{.}0.$

The expected rate of return on any portfolio must be positive.