According to the text, which is true of the theory of constraints (TOC)?

a. Workers on non-bottleneck subsystems have zero effect on the bottom line.

b. Identifying bottleneck subsystems can help in selecting project KOVs.

c. Intermediate variables cannot relate to total system profits.

d. All of the above are true of the theory of constraints.

e. Only the answers in parts “b” and “c” are correct.