Question $9$

Project $3$ can be selected only if both Projects $1$ and $2$ are selected,

but if both Projects $1$ and $2$ are selected, Project $3$ doesn't have to

be selected. The appropriate constraint would be

x$3>=$x$1+$x$2$

x$1+$x$2>=$x$3$

x$1>=$x$3$ and x$2>=$x$3$

x$1+$x$2+$x

None of the above

Is it B or C$,$ and why? Please give correct answer I will upvote