A mortgage of $420,000 has principal payments totaling $120,000 that are due within the next year. The remaining $300,000 is not due until after one year. How is the mortgage shown on the balance sheet?

A. As a current liability of $420,000

B. As a long-term liability of $420,000

C. As another liability of $420,000 with a footnote breaking out current and long-term portions

D. As a current liability of $120,000 and a long-term liability of $300,000

E. As a disclosure item only