A finance journal, which publishes research on current financial topics, states that the maturity term for a certificate of deposit is, on average, 10 years. A banker believes the average maturity term at their bank is different than the amount quoted in the finance journal. After completing a study, the banker found that the average maturity term for a certificate of deposit is 8 years, on average. As the banker sets up a hypothesis test to determine if their belief is correct, what is the banker's claim?

a. Certificates of deposit mature at 10 years. 

b. The average maturity term for a certificate of deposit is 10 years. 

c. The average maturity term for a certificate of deposit is different than 8 years. 

d. The average maturity term for a certificate of deposit is different than 10 years.

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