On December 5, 2023, Sputter Corporation invested $500,000 in short-term available-for-sale marketable securities. The market value of this investment was $550,000 at December 31, 2023, but had slipped to $525,000 by December 31, 2024. In financial statements prepared on December 31, 2023, Sputter Corporation reports: Select one: a. Investments in Marketable Securities at $500,000 and a realized gain/loss. b. Investments in Marketable Securities at $500,000, and a $50,000 unrealized gain/loss. c. Investments in Marketable Securities at $550,000, and a $50,000 unrealized gain/loss. d. Investments in Marketable Securities at $550,000, and a $50,000 realized gain/loss.