The options are for passes for all 3 days (full registration) including the awards banquet, or for each day individually.
If you are an employee of an organisation which is a full member of the HAI, you will be eligible for the reduces rates.
I do not know how the form sorts eligibility for member rates, as it identified mine by Company. If you are employed by a member organisation, then enter the details and select the appropriate discounted price. I can only imagine (but maybe not!) it will reject your reservation if it defines you as ineligible.
Does that help?