Final answer:
The correct statement regarding investment risk is that Beta is a measure of systematic, non-diversifiable risk and Beta captures all the risk inherent in an individual security.
Step-by-step explanation:
The correct statement regarding investment risk is option a.) 1 and 5. Option 1 states that Beta is a measure of systematic, non-diversifiable risk, which is correct. Beta measures the sensitivity of a security's returns to the overall market returns.
Option 5 states that Beta captures all the risk inherent in an individual security, which is also correct. A security with a high Beta indicates higher systematic risk.