Refer to Table 2. Which of the following statements is correct? O Taking the external cost into account, total surplus declines when the 3rd unit of output is produced and consumed. O If the external benefit per unit of output were $0 instead of $2, then the socially efficient quantity of output would be 4 units. A tax of $4 per unit would enable this market to move from the equilibrium quantity of output to the socially optimal level of output. O The market for flu shots is a market to which the concepts in this table apply very well