What do you think if I would prepare 3 envelopes. The first one has my "answer" and the other 2 the corresponding plan outlines.
I will give her the first and ask not to answer right away.
When she returns with the answer (however long it takes) I will hand her the plan she chose. This time I'll let her read the outline and we can discuss specifics right away if she wants to.
I have to be ready to offer either plan right away, why not do it in that fashion.