As a project manager, Mary is managing 12 different projects. She realized something very interesting related to them. Sometimes they present some unique and particular rules, like the ones for projects #:3,6, and 8 . She concluded that if either project 3 or project 6 is selected, then project 8 must be selected. For integer programming problems, which one of the alternatives listed below correctly models this situation? x3+x6+x81x3x81,x6x81x3+x81,x6+x81x6x8,x3x8 None of the above