Identify the risk management technique being adopted in the following cases.

1.Understanding that WIFI signal may have harmful effect on human health, you continue setup a WIFI system at home.

2.Worrying that the banking system may collapse, you put all your money under your bed.

3.You put on a screen protector and a cover on your phone.

4.When you go travel, you select an airline company which is highly ranked in terms of safety.