How can we identify whether a compilation unit is class or interface from a .class file?

A. A special method to create instances of classes B. A method used for mathematical calculations C. A method to perform string manipulations D. An exception handling mechanism

A. method B. def C. func D. public

A. start() B. main() C. init() D. constructor()

A. Defining multiple methods with the same name in the same class B. Calling methods from another class C. Using methods to load data from a file D. Running methods in parallel threads