ABC Retail, a well$-$established retail chain, is implementing a new strategy to enhance its online presence and customer engagement. The strategy includes launching a user$-$friendly mobile app, improving the e$-$commerce platform, and introducing personalized promotions. However, midway through implementation, the company faces challenges in achieving the desired results.a$)$ Analyze FOUR $(4)$ potential barriers and issues that ABC Retail might encounter during the implementation of its online strategy. Provide ONE $(1)$ recommendation on how ABC Retail can overcome each barrier. $(12$ marks$)$b$)$ Differentiate between strategy formulation and strategy implementation.