Which of the following statements is most accurate?

a. most manufacturing firms are turning to an assembly line layout to produce output as efficiently as possible
b. for service firms, the main objective in facility layout usually is to centralize the control of operations
c. facility layout is important for manufacturing plants because facilities layout decisions can have a huge impact on the firm's costs
d. in a modular layout, workers are assigned a specific station along an assembly line and specialize in performing a specific task