I want to allow my customers to select course choices by selecting one or more option buttons.
To allow for more than one choice, you’ll need to use checkboxes.
Radio buttons allow for one and only one selection.

ok, thx. Is there a way to make multiple choices from a drop down list?
No that I know of … also, not advisable, because if it did work there are different ways to do it based on the operating system (hold Control or hold Command, etc.).
Definitely better to do checkboxes.

ok thx for your suggestion!