Michael Porter proposed generic strategies that provide good starting points for strategic thinking. Identify them from the below mentioned strategies.a) Overall cost leadershipb) Innovationc) Focusd) DifferentiationChoose the correct answer from the options given below

• A. and b) only
• B. a), c) and d) only
• C. a), b) and d) only
• D. All of these - a), b), c) and d)