Which of the following statements is true?

a

The four types of unemployment are frictional, structural, seasonal and cyclical.

b

Structural unemploymentrefers basically to those who are between jobs, and it is considered a good type of unemployment and short-term.

c

Frictional unemploymentis caused by either skills mismatch or geographic mismatch between job seekers and employers. This can be a long-term type of unemployment.

d

All of the above.

e

Only a) and b)