Final answer:
Michael Porter's group of strategies used at the competitive strategy level is called generic strategies, which consist of cost leadership, differentiation, and focus.
Step-by-step explanation:
The name given to Michael Porter's group of strategies used at the competitive (business) strategy level is generic strategies. These strategies were introduced by Porter in his book 'Competitive Strategy: Techniques for Analysing Industries and Competitors'. The generic strategies consist of three main options: cost leadership, differentiation, and focus. Cost leadership focuses on offering products or services at a lower cost than competitors, while differentiation focuses on offering unique features or attributes that set a business apart from its competitors. The focus strategy involves targeting a specific market segment or niche.