Many projectors still only accept a VGA connection, especially in fixed installations. And while older Windows notebooks usually have a VGA port directly available, Macbooks always need an adapter, as far as I understand it.
How many different adapters are there for reasonably recent versions of Macbooks (that are likely to be still in use today)? Sometimes the owners of the Macbooks forget those adapters, and then a hectic search for other Apple users starts in the hope of finding the adapter.
If I wanted to have a set of adapters in case any Macbook owner forgot theirs, how many and which ones exactly would I need?