Operation Management Assignment Questions and Instructions

Course: BBA program
Subject: Operation Management

Questions 1:
<Inventory Control>
If inventory is shortage / out of parts, so far, what is the solution to solve this problem between customer?
1. safety control
2. use second sources
3. change production plan
4. take more information from customer to hole the relationship
(please use the long style answer)

Questions 2:
What is the different between MRP and ERP?