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Software EngineeringDescribe unit testing, integration testing and system testing—how they differ and what each addresses.20257mSoftware EngineeringInstead of having a onetime testing of a software at the end of its development, why are three different levels of testing - unit testing, integration testing, system testing and acceptance testing - necessary? What is the main purpose of each of these different levels of testing?20247mSoftware EngineeringSystem Testing performed by a friendly set of customers is called (i) Alpha Testing (ii) Beta Testing (iii) Performance Testing (iv) Usability Testing20242mOPERATING SYSTEMWhat is operating system? (i) Collection of programs that manages hardware resources (ii) System service provider to the application programs (iii) Interface between user and hardware (iv) All of the above20192m