What is core competency? How is it related to competitive advantage?

1. Briefly discuss the four principal managerial tasks.2. What is core competency? How is it related to competitive advantage?3. Discuss the idea that ethics may change over time. Give an example of an ethical value that may be changing in the culture in which you presently live. Explain.4. Discuss the three levels of planning and their respective strategies. For an organization of choice, give an example of a strategy that can be applied at each level.No sources directly needed but can you please include the websites you got the information from just incase. Thanks