• Insurance Companies: Insurance companies have large funds that they need to invest securely for long-term returns. Corporate bonds and government securities fit this investment profile. Hence, this statement is correct.

• Pension Funds: Similar to insurance companies, pension funds manage retirement savings and need safe, long-term investment avenues like corporate bonds and government securities. Hence, this statement is correct.

• Retail Investors: Retail investors can also invest in corporate bonds and government securities, though the process might be slightly more complex than investing in stocks. Various platforms and brokers facilitate such investments. Hence, this statement is correct.

Therefore, all three statements are correct.