Competitive advantage can best be described as B) what sets an organization apart. See full answer below.
A Defender protects their current markets, maintains stable growth, and serves current customers. An Analyzer maintains current markets and current customer satisfaction with moderate emphasis on innovation.
In their 1978 book Organization Strategy, Structure, and Process, Raymond E. Miles and Charles C. Snow argued that different company strategies arise from the way companies decide to address three fundamental problems: entrepreneurial, engineering (or operational), and administrative problems.
Companies with a Defender strategy are not looking to change their position in the market, instead they wish to defend and maintain their position whilst improving their margins.