What is one of the reasons why employers are hiring more part-time or contingency workers?

(a) It’s hard to get people to work full-time anymore.

(b) Part-timers are known to work much harder than full-timers.

(c) Full-time employees don’t have up-to-date job skills.

(d) It’s easy to hire part-timers when you need them, and let them go when you don’t.