Answer:
iii and iv are correct!
Explanation:
Frictional unemployment happens in a stabilized economy. This occurs when workers quit their job for some reason, and also when new workers enter jobs. This is the situation that occurs in options iii and iv. In alternative i there is an example of cyclical unemployment caused by changes in the economy. In alternative ii there is an example of structural unemployment, which is unemployment due to longer lasting factors such as government policies.