Final answer:
Among the given options, procrastination is not a legitimate competitive strategy. Cost leadership, differentiation, and focus are recognized strategies for achieving competitive advantage in strategic management.
Step-by-step explanation:
The competitive strategies that are commonly referred to in business, especially when enhanced by information technology, include cost leadership, differentiation, and focus. These strategies are part of Michael Porter's generic strategies aimed at achieving a sustainable competitive advantage.
Among the options provided, procrastination is not recognized as a legitimate competitive strategy; rather, it refers to the act of delaying or postponing tasks. Procrastination is generally viewed negatively in the context of strategic management and does not contribute to achieving competitive advantage in any known strategic framework.