In multi-programmed systems, it is advantageous if some programs such as editors and compilers can be shared by several users.
Which of the following must be true of multi-programmed systems in order that a single copy of a program can be shared by several users?

I. The program is a macro
II. The program is recursive
III. The program is reentrant
(A) I only
(B) II only
(C) Ill only
(D) I, II and III

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