A firm had to pay $15,000 one year ago to a landlord to open a business in a retail space.The $15,000 is non-refundable.Each month the firm must pay rent, insurance, and salary expenses of $60,000, an amount that does not change.Last month the firm's total costs were $100,000.Which of the following statements is correct?

Group of answer choices

The firm's total fixed cost is $60,000, its total variable cost is $40,000, and its sunk cost is $115,000.

The firm's total fixed cost is $40,000, its total variable cost is $60,000, and its sunk cost is $100,000.

The firm's total fixed cost is $15,000, its total variable cost is $40,000, and its sunk cost is $100,000.

The firm's total fixed cost is $15,000, its total variable cost is $60,000, and its sunk cost is $40,000.

The firm's total fixed cost is $60,000, its total variable cost is $40,000, and its sunk cost is $15,000.