In connection with the adoption of an eligible child who is a U.S. citizen and who is not a child with special needs, Sean pays $4,000 of qualified adoption expenses in 2015 and $3,000 of qualified adoption expenses in 2016. The adoption is finalized in 2016. There is no phase-out of the adoption credit. What are the adoption credits for both 2015 and 2016, respectively?

a. $0; $7,000
b. $4,000; $1,000
c. $4,000; $3,000
d. $7,000; $0