For a certain firm, the 100th unit of output that the firm produces has a marginal revenue of $10 and a marginal cost of $11. It follows that the

production of the 110th unit of output must increase the firm's profit but by less than $1.

firm's profit-maximizing level of output is greater than 100 units.

production of the 100th unit of output increases the firm's average total cost by $1.

production of the 100th unit of output increases the firm's profit by $1.

firm's profit-maximizing level of output is less than 100 units.