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?

Group of answer choices

x$3+$ x$6+$ x$8<=1$

x$3-$ x$8<=1,$ x$6-$ x$8<=1$

x$3+$ x$8<=1,$ x$6+$ x$8<=1$

x$6<=$ x$8,$ x$3<=$ x$8$