Identify the correct statement$($s$).$

a$.$ Within the production and operations management process, mapping is needed to expose the reality of process behaviour.

b$.$ Throughput time in production and operations management is calculated by multiplying cycle time and work$-$in$-$progress.

c$.$ Design within production and operations management should always be judged on its quality, speed, dependability, flexibility and cost.

d$.$ Within production and operations management, wontinuous processes refer to low volume and high variety.

e$.$ The project process within production and operations management refers to high volume and low variety.