What is the difference between an assembler and a compiler ?

A. an assembler converts a machine language code into assembly level language code while a compiler converts high level programming language to a machine language code.
B. an assembler converts assembly level language code into machine language code while a compiler converts high level programming language code to a machine language code.  
C. a compiler converts assembly level language code into machine lange while an assembler converts high level programming language to a machine language code.
D. they both convert assembly level language code into machine lange

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Correct Answer: B