I have a custom form set up on my website. The form is connected to a dataset and submits the information to the dataset. In that form there's a dropdown input. I want to create like a "formula" or something where once 2 people choose 1 of the options from the dropdown, that option will no longer appear to future visitors. It doesn't need to be a dropdown, it can be a radio button or checkbox to display the options, but either way, once 2 people select that same option, it would no longer be pickable or disappear from the options listed. How can I do this?
Example: Every one who fills the form will pick a time slot from the dropdown, so once two people picked that time slot, it would no longer be available for the next person who fills the form.