Answer:
The correct option is (d)
Step-by-step explanation:
Competitive advantage refers to the edge a company has over its competitors for its unique product, design or high demand.
Competitive advantage is obtained only when a company's product is unique or distinct in terms of price, quality, design or use.
Here, Gladiator company is a market leader as it derived competitive advantage from design patents that its competitors do not have. Rest of the resources like land and building, machinery and plant and raw materials are common to all.