First Bank loaned $$400,000$ to Thomas, taking a security interest in his yacht. Thomas defaulted on the loan and Firs Bank repossessed the boat. First Bank sold the yacht at a public sale. The sale yielded $$50,000$ more than the debt. First Bank

a$)$ must pay Thomas the $$50,000.$

b$)$ is entitled keep the $$50,000.$

C$)$ must share the $$50,000$ equally with Thomas.

d$)$ must pay the surplus to the Secretary of State.