Farah is in her early 60s and planning to retire within the next couple of years. Aside from her savings in her CPF account and a HDB flat, she does not have any other valuable assets. She expects to have a modest retirement lifestyle and will likely live past eighty years old. The following are some financial products available for investment:

The Straits Times Index (STI)

Early start-up business

Corporate bond with AAA rating

Ether (cryptocurrency)

Discuss which financial products Farah should and should not invest for her

retirement.