【单选题】Which of the following is right about systematic risk and unsystematic risk?
A.
Unsystematic risk arises due to random and unpredicted factors. It can be diversified away by holding a portfolio of investments.
B.
Systematic risk is caused by factors that affect all firms and therefore cannot be eliminated by diversification.
C.
Unsystematic risk is also known as Non-diversification risk
D.
Both A and B are right