For the year ended December 31, 2022, Octo Inc. reported net income before federal income tax expense of $800,000 per the corporation's books. This figure included the following items: Interest income on tax-exempt municipal securities $30,000 Loss on sale of land acquired in 1998 as an investment 40,000 Interest expense on loan to purchase tax-exempt municipal securities 10,000 What is the taxable income of Octo Inc. for 2022? a.$820,000 b.$870,000 c.$830,000 d.$800,000