In the Toyota Production System, jidoka refers to
a. Level production, where different models are produced alongside each other on the assembly line.
b. Continuous improvement, where workers organize meetings to discuss ways of improving the production process.
c. The inventory retrieval system where parts are replenished only when they are needed.
d. The aggressive reduction of changeover and setup times.
e. Continuous line-balancing to maximize utilization.
f. The cross-training of workers for a wide range of skills.
g. None of the above.