Which of the following statements concerning risk are correct?

I. Systematic risk is measured by beta.

II. The risk premium of a risky asset increases as diversifiable risk increases.

III. Systematic risk is another name for nondiversifiable risk.

IV. Diversifiable risks are systematic risks you cannot avoid.

A.I and III only

B.II and IV only

C.I and II only

D.III and IV only

E.I, II, and III only