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Which of the following statements regarding the capital allocation line $($CAL$)$ is false?

Select one:

a$.$ The slope of the CAL equals the increase in the expected return of the complete portfolio per unit of additional standard deviation.

b$.$ All of the statements are true.

c$.$ The CAL dominates the efficient frontier except at $P**.$

d$.$ The CAL shows risk$-$return combinations.

e$.$ All portfolios on the CAL have the same Sharpe ratio as the optimal risky portfolio.