True or false?

And which of the following are correct

Floating-rate bonds pay interest based on an inflation index, such as the consumer price index (CPI). Which of the following statements is correct? O a. Combining stocks that are perfectly negatively correlated and that have the same beta coefficient into a portfolio is riskier than holding an individual stock, because the portfolio will not benefit from diversification. b. A stock's beta can be calculated by comparing its returns to the market's returns over some time period because the beta coefficient measures a stock's volatility relative to market. O c. A security's beta measures its diversifiable (firm-specific) risk relative to that of other securities. O d. If the returns of two firms are negatively correlated, one of them must have a negative beta. O e. A stock's beta is less relevant as a measure of risk to an investor with a well-diversified portfolio than to an investor who holds only one stock