Question: Let x1 and x2 be 0-1 variables whose values indicate whether projects 1 and 2 are not done or are done. Which answer below indicates

Let x1 and x2 be 0-1 variables whose values indicate whether projects 1 and 2 are not done or are done. Which answer below indicates that project 2 can be done only is project 1 is done.

A. x1 + x2 = 1

B. x1 - x2 >=0

C. x1 -x2 <=0

D. x1 + x2 = 2

E. None of the above

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