Answer:
safe or risk free, risky, safest
Step-by-step explanation:
In investment market, risk is defined as the potential for the variability in the outcomes of the investment. Thus it is meant that outcome or return of making an investment is safe and risk free if there is only one return or outcome. But if there are more than one possible return from the investment, then that investment is considered as risky. For this reason the securities sold by the United States' Treasury is considered to be the safest securities in the world as the investor will receive the face value of the security upon its maturity from the government.