On January 2, 2018, Keystone Company borrowed $60,000 from Bank Three. The loan was to be repaid in equal principal installments of $10,000, payable on December 31 of each year, beginning on December 31, 2018. Disregarding interest, the amount of the $60,000 loan that should be considered a long-term liability on the company's balance sheet for the year ended December 31, 2019 would be: $30,000 $40,000 $50,000 O $20,000 O None of the above.