A pattern in the coefficients of the time fixed effects binary variables may reveal the following in a study of the determinants of total factor productivity growth using panel data: a. total factor productivity shocks for particular entities in the panel. b. total factor productivity shocks for individual entities. c. there is no economic information that can be retrieved from these coefficients. d. An increase in total factor productivity that benefits all entities equally in a given year. e. All of the above. f. None of the above