(Table: Total and Marginal Revenue I) Which of the following is (are) TRUE? 
I. A = B = $400
II) C = $200
III) D = $0
Definitions:
Carrying Value
The recorded cost of an asset in a company's books after adjusting for depreciation, amortization, or impairment costs.
Retirement
The act of leaving one's job and ceasing to work, typically due to reaching a certain age or health condition, often involving receiving pensions or retirement savings.
Gain or Loss
The financial result from selling an asset for more or less than its purchase price.
Par Value
The nominal or face value of a bond, stock, or coupon as stated by the issuer, which is typically not related to its market value.
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