In computer terminology, a compiler means

1. a person who computes source programs
2. the same thing as a programmer
3. a key puncher operator
4. a program which translates high level language program to machine language

The primary job of the operating system of a computer is to

1. command resources
2. be user friendly
3. provide utilities
4. all the above

The term "operating system" refers to

1. a set of programs which controls computer working
2. the way a computer operator works
3. conversion of high level language into machine code
4. the way a floppy disk drive operates

Operating System is

1. a collection of hardware components
2. a collection of input-output devices
3. a collection of software routines
4. all of the above