In the 1980s and 1990s, many recognized that a. the efforts in the 1950s and 1960s to improve the managerial usefulness of conventional cost systems were entirely successful. b. the cost of more...

a. the efforts in the 1950s and 1960s to improve the managerial usefulness of conventional cost systems were entirely successful.

b. the cost of more detailed cost systems exceeded their benefits.

c. the traditional management accounting system was obsolete.

d. more accurate product costing was needed.

e. All of the above are true.

f. Only c and d are true.