Asset allocation may involve: A$)$ the decision as to the allocation between a risk$-$free asset and a risky asset and considerable security analysis. B$)$ the decision as to the allocation between a risk$-$free asset and a risky asset and the decision as to the allocation among different risky assets. C$)$ the decision as to the allocation among different risky assets and considerable security analysis. D$)$ the decision as to the allocation between a risk$-$loving asset and a risky asset. E$)$ considerable security analysis