A risk premia should:

$[$Select all statements that a true$/$correct$.$ Incorrectly selected statements will penalize your total score$]$

a$.$ Never exceed the risk$-$free rate

b$.$ Be positive if the risk is disliked

c$.$ Cannot be estimated with any known methods of statistical analysis

d$.$ Rise if the risk becomes more concerning to all investors

e$.$ Be determined by the marginal trader $($person just on the edge of buying$/$selling the stock$)$

f$.$ Never be equal to zero