Special words or symbol that denote a special meaning to the compiler and cannot be used for variable or function names are: a. language primitives b. subroutines c. header names d. reserved or keywords Variable that can be accessed and altered only within the function in which they are defined are called: a. user defined variables b. static variables c. local variables d. global variables Passing argument be means of making a copy of the variable's content is known as passing by: a. value b. name c. reference d. inheritance The function that must always return control to the operating system is known as: a. private b. header c. initial method d. main