Last week Sam, who is $55$ years old and has been a steelworker for $30$ years, quit his job. He has spent the past few days browsing help wanted ads but hasn't found anything that matches his skills. Sam is experiencing:

Question $4$ options:

$1)$

permanent unemployment.

$2)$

structural unemployment.

$3)$

cyclical unemployment.

$4)$

frictional unemployment.