Which one of the following accounts for why a portion of a company's strategy is always developed on the fly?

To remain competitive, a company always has to quickly try to imitate as many of the strategy changes made by the marke leader as is feasible.

Frequent fine$-$tuning of a company's strategy is essential to forcing rivals into a defensive posture where they spend most their time scrambling to respond to its fresh competitive moves in the marketplace.

Managers must always be willing to supplement or modify various proactive strategy elements with as$-$needed reactions to unanticipated happenings in the surrounding environment.

To be profitable and competitively successful, company managers must be highly innovative, always on the lookout for new and better ways to more strongly differentiate the company's product$/$service from the product$/$service offerings of rivals.

Many of the elements of a company's strategy typically have a short life and soon lose their effectiveness, forcing company managements to institute frequent strategy changes to keep their strategies in step with fast$-$changing buyer preferences and the latest market maneuvers of rivals.