What is the safest investment with the highest return?

In today's expensive world expenses are more and income is less finding a good investment option is need so here some of the safest investment with the highest return are as follows:

• Treasury Bonds.
• Treasury Inflation-Protected Securities.
• Municipal Bonds.
• Corporate Bonds.
• SIP and ULIP Funds.
• National Pension System.
• Public Provident Fund.
• Bank Fixed Deposit.
• Corporate bonds.
• Dividend-paying stocks.
• Preferred stocks.

These are some safest investment options with the highest return.