GM$,$ a world leader in automotive manufacturing, is quickly losing market share to Toyota. Toyota's competitive advantage is that it can produce high$-$quality cars at a lower price than GM$.$ This is due to Toyota's manufacturing innovation processes, resulting in quicker change and lower cost. What is the logical next step for GM to quickly get back on a competitive par with Toyota?

a$.$ Invention of a new vehicle

b$.$ Imitation of Toyota's processes

c$.$ Innovation of a new vehicle niche

d$.$ Innovation through acquisition of Toyota