Which of the following statements is$/$are true about the variance of the possible future returns on a financial asset?

Select one:

a$.$ The standard deviation of the possible returns on an asset is equal to the square of the variance of the possible returns.

b$.$ Standard deviation of returns can be computed without considering probabilities, but variance cannot.

c$.$ The standard deviation of the possible returns on an asset is equal to the square root of the variance of the possible returns.

d$.$ The variance and the standard deviation of the possible returns on a risk$-$free asset are negative.

e$.$ Low$-$variance securities are high$-$standard deviation securities$.$