What type of investments are unlikely to be largely affected by a recession?

Inverse market index ETFs. These increase in price the more the major indexes decrease.

1) Deposit saving

2) Singapore saving bond

3) High grade investment grade bonds

4) Gold due to lower correlation with other asset classes

5) Defensive sectors such as consumer discretionary and utilitiy companies, however this is of lesser extend because the correlation with general market is relatively low compared to other sectors but still positive