Regina is a German translator who works from home. The company that she works for posts translation jobs on their website and claiming the jobs is on a first-come, first-served basis. Regina regularly checks the website, she doesn't want to miss out on jobs because other translators claim them. Sometimes she has to check the website 20 times to land one translation job. Which schedule of partial reinforcement is the closest match to this scenario?
a. Fixed ratio schedule
b. Variable interval schedule
c. Variable ratio schedule
d. Fixed interval schedule