Some people claim that degrees in liberal arts do not really train students for the job market. Their education provides little training value for their future jobs. According to the theory of signaling, why are such "useless" degrees useful in the job market?

a. All of the answers are correct

b. The fact that the students completed the degrees signals to their potential employers that they can learn and perform

c. The fact that students want to complete such degrees signals that they care about the knowledge they accumulate

d. The fact that student loans are available to students in all disciplines signals that the government cares about such degrees