Sam buys a brand new $850 guitar using the store's financing. He will make monthly payments of $38.90 for 3 years. If Sam does not keep up with his monthly payments, however, the guitar may be repossessed. What form of credit did Sam use to buy the guitar?
a. Non-revolving, unsecured
b. Revolving, secured
c. Non-revolving, secured
d. Revolving, unsecured
