This is a question with answer options. Goal: how far in advanced to get the salad ready for dinner

Which of the following methods is more reasonable for accomplishing this goal?

pick from the following.
[I] Prepping salad before serving is a huge time saver. Layer all the ingredients in a bowl and don't add the dressing until it's time to serve.;
[II] Prepping salad before serving is a huge time saver. Layer all the ingredients in a bowl and don't add the soy sauce and mustard until it's time to serve.;...I think the answer is
[I]