Come up with the ER diagram with step$-$by$-$step explanation on the following case study and their Cardinality $1.$ Case Study: Use the distributed database in E$-$Learning system$2.$ Case Study on Inventory making and Customer Order on the Pharmaceutical Limited Mr$.$ Hanson Affum the owner of HAF Pharmaceutical Limited renders a wholesales services in pharmaceutical drugs. A year after opening has earn more profit which has extended his services from a region to five regions and has also increased the number of customers who patronage his services. Upon many deliberation, saw the need to introduce a computer based system that could aid in inventory making and customer orders. As his project manager, you've been tasked to structure a small database system using access to handle inventory or stock making and process customer orders