Ted believes that he currently owns a portfolio which is adequately diversified. If he is correct, the addition of a $\_\_\_\_\_\_\_\_$ asset to the portfolio will have minimal, if any, effect on the portfolio's $\_\_\_\_\_\_\_\_.$

a$.$

risky; rate of return

b$.$

risky; beta

c$.$

risk$-$free; beta

d$.$

risky; standard deviation

e$.$

risk$-$free; rate of return