Nicholas Smith Fitness Gym has $700,000 of 20-year bonds payable outstanding. These bonds had a discount of $56,000 at issuance, which was 10 years ago. The company uses the straight-line amortization method. The current carrying amount of these bonds payable is:
a. $672,000.
b. $644,000.
c. $700,000.
d. $728,000.