Which of the Following People Would Be Considered to Be

Which of the following people would be considered to be working a nonstandard job?

A) Tracey,a college professor who teaches two sociology classes and is hoping that she will be offered the position again the next time the courses are offered
B) Tom,a licensed practical nurse,who instead of working 8 hours a day,5 days a week,opted for 10 hour shifts over 4 days,so he could have 3-day weekends
C) Tim,who cleans pools for Pool Service One in the summer months and then works in the company's showroom in the off-season
D) Teena,a stockbroker working for Marsh & Mitchell Brokerage,until she can find a job closer to her family